Attachment

CONSTRUCTION CODE APPEALS COMMITTEE AGENDA MARCH 31, 2015 - 9:00 A.M. CITY HALL CONFERENCE ROOM 15 LOOCKERMAN PLAZA DOVER, DELAWARE PUBLIC COMMENTS ARE WELCOMED ON ANY ITEM AND WILL BE PERMITTED AT APPROPRIATE TIMES. WHEN POSSIBLE, PLEASE NOTIFY THE CITY CLERK (736-7008 OR E-MAIL AT CITYCLERK@DOVER.DE.US) SHOULD YOU WISH TO BE RECOGNIZED. CONSTRUCTION CODE APPEALS COMMITTEE MEMBERS COUNCILMAN ADAM M. PERZA, CHAIR COUNCILMAN DAVID ANDERSON SCOTT D. KOENIG, CITY MANAGER AGENDA ADDITIONS/DELETIONS 1. APPEAL OF REQUIREMENT FOR A COMMERCIAL KITCHEN HOOD - 147 S. GOVERNORS AVENUE (TIFFANEE LEE-SCOTT) 2. ADJOURNMENT /DD S:\CLERKSOFFICE\AGENDAS&MINUTES\MISC-AGENDAS\CODE BOARD OF APPEALS\07-21-03. AGENDA.WPD THE AGENDA ITEMS AS LISTED MAY NOT BE CONSIDERED IN SEQUENCE. THIS AGENDA IS SUBJECT TO CHANGE TO INCLUDE THE ADDITION OR THE DELETION OF ITEMS, INCLUDING EXECUTIVE SESSIONS.

Stein, Jody From: Tiffanee Lee-Scott <tiffandcompany@yahoo.com> Sent: Monday, March 02, 2015 12:47 PM To: City Clerks Office Subject: Ventilation Hood Appeal Good afternoon. I am writing this letter because I am appealing the decision made by the City of Dover to install a hood system for my commercial convection oven. I turned in a copy of the equipment that would be in my business along with the application for my building permit on or before June 2014. It was never once mentioned to me that I would need a hood until the day I planned on having my grand opening on October 3, 2014. Public Health does a review of all equipment and facilities before giving their approval, which was also turned in with my building permit. They did not see the need for a hood system. I also had the head technical support agent for the manufacturer of my oven send an email, which was forwarded to Tim Mullaney and Ann Marie, stating a hood was not necessary for my oven. Apparently, that was not sufficient, so I arranged for Ann Marie and Tim to speak with that same person directly while I listened. Bob Petrie (the same man that sent the email) reiterated the fact that a hood was not necessary for my oven. He stated that the only thing a hood would do would get rid of some residual heat and the smell. I'm not sure why either of those things would be a necessity. Last Wednesday, Chris (from the city, I'm not sure his last name) came to inspect my oven to see if a hood was necessary in his opinion. He could not even tell the oven was on. I mention that because the oven does not let out an extensive amount of heat and the thought of getting rid of the smell in a bakery makes no sense to me. It also seemed as if Chris was shocked to find out that the manufacturer of the oven reported to Ann Marie and Tim that a hood was not necessary. He had no record of that conversation ever happening. With that being said, I would just like an appeal hearing date set so that this issue can be resolved as quickly as possible. Thank you for your time. Tiffanee Lee-Scott Tiffanee & Co. Bakery 147 S Governors Ave Dover De 19904 302-674-CAKE (office) 1

Dover, Delaware Code of Ordinances – Part II – Code of Ordinances Chapter 22 – Buildings and Building Regulations Article I – In General Sec. 22-1. - Construction code appeals committee. (a) Established; composition; appointment. There shall be a committee to be referred to as the "construction code appeals committee," consisting of three members, one of whom shall be the city manager and the other two being elected city officials. The city officials shall be appointed by the city council president at the council annual meeting. (b) Appeals. Whenever any person is aggrieved by a decision of the building inspector with respect to the provision of this chapter, it is the right of that person to appeal to the construction code appeals committee. Such appeal must be filed, in writing, within 30 days after the determination by the building inspector. (c) Notice; hearing. Upon receipt of such an appeal, the construction code appeals committee shall set a time and place in not less than ten, nor more than 30 days for the purpose of hearing the appeal. Notice of the time and place of the hearing of the appeal shall be given to all parties, at which time they may appear and be heard. The determination by the construction code appeals committee shall be final in all cases. (Code 1981, § 5-3; Ord. of 4-25-1994) Page 1

Dover, Delaware Code of Ordinances – Part II – Code of Ordinances Chapter 22 – Buildings and Building Regulations Article V – Mechanical Code Sec. 22-141. - Adopted. (a) Certain documents, three copies of which are on file in the licensing and permitting office of the city, being marked and designated as the International Mechanical Code 2009 Edition, including appendix chapter "A", as referenced in the building code adopted in 22-61(a), published by the International Code Council, be and is hereby adopted as the code of the city for regulating the design, construction, quality of materials, erection, installation, alteration, repair, location, relocation, replacement, addition to, use or maintenance of mechanical systems in the city and providing for the issuance of permits and collection of fees therefore; and each and all of the regulations, provisions, conditions and terms of such International Mechanical Code, as referenced in the building code adopted in section 22-61(a), published by the International Code Council, on file in the office of the city are hereby referred to, adopted and made a part hereof as if fully set out in this section. The following sections of the International Mechanical Code are hereby revised: Section 101.1 Title. Insert "City of Dover, DE" in place of "[NAME OF JURISDICTION]" 106.5 Fee Schedule. Insert "See DCO Section 22-145 Heating, air conditioning, and heat pump permit fees" in place of "The fees for all mechanical work shall be as indicated in the following schedule:" In place of: Section 106.5.3 Fee refunds. Delete in its entirety. SECTION 108 VIOLATIONS Section 108.4 Violation Penalties. Insert "See Section 22-61(a) International Building Code Section 113.4, Violation Penalties" in place of "Any person who shall violate a provision of this code or shall fail to comply with any of the requirements thereof or who shall erect, install, alters, or repair, a plumbing work in violation of the approved construction documents or directive of the code official, or of a permit or certificate issued under the provisions of this code, shall be guilty of a [SPECIFY OFFENSE], punishable by a fine of not more than [AMOUNT], or by imprisonment not exceeding thirty (30) days, or both such fine and imprisonment. Each day that a violation continues after due notice has been served shall be deemed a separate offense." Section 108.5 Stop work orders. Insert "See 22-61(a)International Building Code, Section 114.3 Unlawful continuance" in place of "Upon notice from the code official that mechanical work is being done contrary to the provisions of this code or in a dangerous and unsafe manner such work shall immediately cease. Such notice shall be in writing and shall be given to the owner of the property, or to the owner's agent, or to the person doing the work. The notice shall state the conditions under which work is authorized to resume. Where an emergency exists, the code official shall not be required to give a written notice prior to stopping work. Any person who shall continue any work in or about the structure after having been served with a stop work order, except such work as that person is directed to remove a violation or unsafe condition, shall be charged with a violation of this section and shall be liable to a fine of not less than [AMOUNT] dollars or more than [AMOUNT] dollars" SECTION 109 MEANS OF APPEAL. Delete section in its entirety. (b) If any section, subsection, sentence, clause or phrase of this section is, for any reason, held to be unconstitutional, such decision shall not affect the validity of the remaining portions of this section. The city council hereby declares that it would have passed the ordinance from which this section derives, and each section, subsection, clause or phrase thereof, irrespective of the fact that any one (1) or more sections, subsections, sentences, clauses and phrases be declared unconstitutional. (Code 1981, § 5-56; Ord. of 4-9-1984, § 2; Ord. of 3-11-1991; Ord. of 4-25-1994; Ord. of 1-27-1997; Ord. of 3-13-2000; Ord. of 4-11-2005(4); Ord. of 4-14-2008; Ord. No. 2010-02, 5-10-2010) Page 1

DEFINITIONS operating conditions used to move heat from one lo~ati.on to Open-spray system. A system in which a secondary cool- another. Refrigerants are not included as heat transfer hqmds. ant is cooled or heated by the refrigerating system and then circulated in direct contact with the air or other substance to HEAVY-DUTY COOKING APPLIANCE. Heavy-duty be cooled or heated. cooking appliances include electric under-fired broilers, elec- tric chain (conveyor) broilers, gas under-fired broilers, gas Vented closed system. A system in which a secondary cool- chain (conveyor) broilers, gas open-burner ranges (with or ant is cooled or heated by the refrigerating system and then I without oven), electric and gas wok ranges, and electric and gas passed through a closed circuit in the air or other substance over-fired (upright) broilers and salamanders. to be cooled or heated, except that the evaporator or con- denser is placed in an open or appropriately vented tank. HIGH-PROBABILITY SYSTEMS. A refrigeration system in which the basic design or the location of components is such INTERLOCK. A device actuated by another device with that a leakage of refrigerant from a failed connection, seal or which it is directly associated, to govern succeeding operations component will enter an occupancy classified area, other than of the same or allied devices. A circuit in which a given action the machinery room. cannot occur until after one or more other actions have taken place. HIGH-SIDE PRESSURE. The parts of a refrigerating system subject to condenser pressure. JOINT, FLANGED. A joint made by bolting together a pair of flanged ends. HOOD. An air intake device used to capture by entrapment, impingement, adhesion or similar means, grease, moisture, JOINT, FLARED. A metal-to-metal compression joint in heat and similar contaminants before they enter a duct system. which a conical spread is made on the end of a tube that is com- pressed by a flare nut against a mating flare. Type I. A kitchen hood for collecting and removing grease vapors and smoke. Such hoods are equipped with a fire sup- JOINT, MECHANICAL. A general form of gas-tight joints pression system. obtained by the joining of metal parts through a positive-hold- ing mechanical construction, such as flanged joint, screwed Type II. A general kitchen hood for collecting and remov- joint or flared joint. ing steam, vapor, heat, odors and products of combustion. JOINT, PLASTIC ADHESIVE. A joint made in thermoset HYDROGEN GENERATING APPLIANCE. A self-con- plastic piping by the use of an adhesive substance which forms tained package or factory-matched packages of integrated sys- a continuous bond between the mating surfaces without dis- tems for generating gaseous hydrogen. Hydrogen generating solving either one of them. appliances utilize electrolysis, reformation, chemical, or other processes to generate hydrogen. JOINT, PLASTIC HEAT FUSION. A joint made in thermo- plastic piping by heating the parts sufficiently to permit fusion IGNITION SOURCE. A flame, spark or hot surface capable of the materials when the parts are pressed together. of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors and electrical switching JOINT, PLASTIC SOLVENT CEMENT. A joint made in devices. thermoplastic piping by the use of a solvent or solvent cement which forms a continuous bond between the mating surfaces. IMMEDIATELY DANGEROUS TO LIFE OR HEALTH (IDLH). The concentration of airborne contaminants that JOINT, SOLDERED. A gas-tight joint obtained by the join- poses a threat of death, immediate or delayed permanent ing of metal parts with metallic mixtures of alloys which melt at adverse health effects, or effects that could prevent escape from temperatures between 400°F (204°C) and l,000°F (538°C). such an environment. This contaminant concentration level is JOINT, WELDED. A gas-tight joint obtained by the joining established by the National Institute of Occupational Safety and Health (NIOSH) based on both toxicity and flammability. of metal parts in molten state. It is generally expressed in parts per million by volume (ppm LABELED. Equipment, materials or products to which have v/v) or milligrams per cubic meter (mg/m3). been affixed a label, seal, symbol or other identifying mark of a INDIRECT REFRIGERATION SYSTEM. A system in nationally recognized testing laboratory, inspection agency or which a secondary coolant cooled or heated by the refrigerat- other organization concerned with product evaluation that maintains periodic inspection of the production of the ing system is circulated to the air or other substance to be above-labeled items and whose labeling indicates either.that cooled or heated. Indirect systems are distinguished by the the equipment, material or product meets identified standards method of application shown below: or has been tested and found suitable for a specified purpose. Closed system. A system in which a secondary fluid is either cooled or heated by the refrigerating system and then LIGHT-DUTY COOKING APPLIANCE. Light-duty cook- ing appliances include gas and electric ovens (including stan- circulated within a closed circuit in indirect contact with the dard, bake, roasting, revolving, retherm, convection, air or other substance to be cooled or heated. combination convection/steamer, countertop conveyorized Double-indirect open-spray system. A system in which baking/finishing, deck and pastry), electric and gas the secondary substance for an indirect open-spray system steam-jacketed kettles, electric and gas pasta cookers, electric is heated or cooled by an intermediate coolant circulated and gas compartment steamers (both pressure and atmo- from a second enclosure. spheric) and electric and gas cheesemelters. 14 2009 INTERNATIONAL MECHANICAL CODE®

EXHAUST SYSTEMS tures are not higher than the top of the fan discharge heat or moisture and do not produce grease or smoke, except opening. where the heat and moisture loads from such appliances are incorporated into the HVAC system design or into the design of a separate removal system. Typ II hoods shall be SECTION 507 install ed above all light-duty appliances that prod uce prod- COMMERCIAL KITCHEN HOODS ucts of combustion and do not produce grease or smoke. 507.1 General. Commercial kitchen exhaust hoods shall com- Spaces conta ining cookjng appliances that do nol require Type II hoods shall be venlllated in accordance w!th Section ply with the requirements of this section. Hoods shall be Type I 403.3. For lhe purpose of determining the noor area or II and shall be designed to capture and confine cooking requi red to be ventilated. each individual appliance that is vapors and residues. Commercial kitchen exhaust hood sys- tems shall operate during the cooking operation. nol requ ired lo be installed under a Ty pe lI hood shall be con idered as occ upying not less than 100 square feet (9.3 Exceptions: m2). 1. Factory-built commercial exhaust hoods which are 507.2.3 Domestic cooking appliances used for commer- tested in accordance with UL 710, listed, labeled and cial purposes. Domestic cooking appliances utilized for I installed in accordance with Section 304.1 shall not commercial purposes s hall be provided with Type I or Type be required to comply with Sections 507.4, 507.7, II hoods as required for the type of appliances and processes 507.11 , 507.12, 507.13, 507.14 and 507.15. in accordance with Sections 507.2, 507.2.l and 507.2.2. 2. Factory-built commercial cooking recirculating sys- 507.2.4 Extra-heavy-duty. Type I hoods for use over tems which are tested in accordance with UL 710B, extra-hea1y -d11ty cooking appliances shall not cover listed, labeled and installed in accordance with Sec- heavy-, m dium- or light-duty appliances. Such hoods shall tion 304 .1 shall not be required to comply with Sec- discharge lo an exhaust system that is jndepencfent of oth er tions 507.4, 507.5, 507.7, 507.12, 507.13, 507.14 and exhaust systems. 507 .15. Spaces in which such systems are located shall be considered to be kitchens and shall be venti- 507.3 Fuel-burning appliances. Where vented fuel-burning lated in accordance with Table 403.3. For the purpose appliances are located in the same room or space as the hood, of determining the floor area required to be ventilated, provisions shall be made to prevent the hood system from inter- each individual appliance shall be considered as fering with normal operation of the appliance vents. occupying not less than 100 square feet (9.3 m2). 507.4 Type l materials. Type 1 hood hal l be constructed of 3. Net exhaust volumes for hoods shall be permitted to steel having a min imum thickness of 0.04 66 inch (1.181 mm) be reduced during part-load cooking conditions, (No. J8 gage) or stainless st el not less than 0.0335 inch where engineered or listed multispeed or vari- [0.8525 mm (No. 20 MSG)] in lhicknes . able-speed controls automatically operate the exhaust 507.5 Type II hood materials. Type II hoods shall be con- system to maintain capture and removal of cooking structed of steel having a minimum thickness of 0.0296 inch effluents as required by this section. Reduced vol- (0.7534 mm) (No. 22 gage) or stainless Slee! not less than umes shall not be below that required to maintain cap- 0.0220 inch (0.5550 mm) (No. 24 gage) in thickness, copper ture and removal of effluents from the idle cooking sheets weighing not less than 24 ounces per square foot (7 .3 appliances that are operating in a standby mode. kg/m 2) or of other approved material and gage. 507.2 Where required. A Type I or Type II hood shall be 507.6 Supports. Type I hoods shall be secured in place by non- installed at or abo·.re all commercial cooking appliances in combustible supports. All Type I and Type II hood supports accordance with Sections 507.2.1 and 507.2 .2. Where any shall be adequate for the applied load of the hood, the unsup- cooking appliance under a single hood requires a Type I hood, ported ductwork, the effluent loading and the possible weight a Type I hood shall be installed. Where a Type II hood is of personnel working in or on the hood. required, a Type I or Type II hood shall be installed. 507.7 Hood joints, seams and penetrations. Hood joints, 507.2.1 Type I hoods. Type I hoods shall be installed where seams and penetrations shall comply with Sections 507. 7.1 and cooking appliances produce grease or smoke. Type I hoods 507.7.2. shall be installed over medium-duty, heavy-duty and extra-heavy-duty cooking appliances. Type I hoods shall be 507. 7.1 Type I hoods. External hood joints, seams and pen- installed over light-duty cooking appliances that produce etrations for Type I hoods shall be made with a continuous grease or smoke. external liquid-tight weld or braze to the lowest outermost perimeter of the hood. Internal hood joints, seams, penetra- 507.2.1.l Operation. Type I hood systems shall be tions, filter support frames and other appendages attached designed and installed to automatically activate the inside the hood shall not be required to be welded or brazed exhaust fan whenever cooking operations occur. The but shall be otherwise sealed to be grease tight. activation of the exhaust fan shall occur through an inter- lock with the cooking appliances, by means of heat sen- Exceptions: sors or by means of other appmved methods. 1. Penetrations shall not be required to be welded or I 507.2.2 Type II hoods. Type II hoods shall be installed above dishwashers and light-duty appliances that produce brazed where sealed by devices that are listed for the application. 50 2009 INTERNATIONAL MECHANICAL CODE®

EXHAUST SYSTEMS 2. Internal welding or brazing of seams, joints and arranged in place or provided with drip-intercepting devices pe11etrations of the hood shall not be prohibited to prevent grease or other condensate from dripping into provided that the joint is formed smooth or ground food or on food preparation surfaces. so as to not trap grease, and is readily cleanable. 507.11.2 Mounting position. Filters shall be installed at an 507.7.2 Type II hoods. Joints, seams and penetrations for angle of not less than 45 degrees (O. 79 rad) from the hori- Type II hoods shall be constructed as set forth in Chapter 6, zontal and shall be equipped with a drip tray beneath the shall be sealed on the interior of the hood and shall provide a lower edge of the filters. smooth surface that is readily cleanable and water tight. 507 .12 Canopy size and location. The inside lower edge of can- 507.8 Cleaning and grease gutters. A hood shall be designed opy-ty pe Type I and II commercial hoo?s shall overhang or to provide for thorough cleaning of the entire hood. Grease gut- extend a horizontal distance of not less lhan 6 inches (152 mm) ters shall drain to an approved collection receptacle that is fab- beyond the edge of the top horizontal surface of the appliance on ricated, designed and installed to allow access for cleaning. all open sides. The vertical distance b tween the front lower lip 507.9 Clearances for Type I hood. A Type I hood shall be of the hood and such surface shall not exceed 4 feet (1219 mm). installed with a clearance to combustibles of not less than 18 Exception: The hood shall be permitted to be flush with the inches (457 mm). outer edge of the cooking surface where the hood is closed Exception: Clearance shall not be required from gypsum to the appliance side by a noncombustible wall or panel. wallboard or 1/ 2-inch (12. 7 mm) or thicker cementitious wallboard attached to noncombustible structures provided 507.13 Capacity of hoods. Commercial food service hoods that a smooth, cleanable, nonabsorbent and noncombustible shall exhaust a minimum net quantity of air determined in material is installed between the hood and the gypsum or accordance with this section and Sections 507 .13.l through cementitious wallboard over an area extending not less than 507.13.4. The net quantity of exhaust airshall be calculated by 18 inches (457 mm) in all directions from the hood. subtracting any airflow supplied directly to a hood cavity from the total exhaust flow rate of a hood. Where any combination of 507 .10 Hoods penetrating a ceiling. Type I hoods or portions heavy-duty. medium-duty and light-duty cooking appliances thereof penetrating a ceiling, wall or furred space shall comply are utilized under a single hood, the exhaust rate required by with all the requirements of Section 506.3.10. this section for the heaviest duty appliance covered by the hood 507.11 Grease filters. Type I hoods shall be equipped with shall be used for the entire hood. listed grease filters designed for the specific purpose. 507.13.l Extra-heavy-duty cooking appliances. The min-1 Grease-collecting equipment shall be provided with access for imum net airflow for hoods, as determined by Section cleaning. The lowest edge of a grease filter located above the 507.2, used for extra-heavy-duty cooking appliances shall cooking surface shall be not less than the height spedfied in be determined as follows: Table 507.11 . TABLE 507.11 Type of Hood CFM per linear foot of hood MINIMUM DISTANCE BETWEEN THE LOWEST EDGE OF A Backshelf/pass-over Not allowed GREASE FILTER AND THE COOKING SURFACE OR THE Double island canopy HEATING SURFACE (per s ide) 550 Eyebrow Not allowed TYPE OF COOKING HEIGHT ABOVE COOKING SURFACE I Single island canopy 700 550 II Wall-mounted canopy I APPLIANCES (feet) For SI: 1 cfm per linear foot= 1.55 Us per linear meter. '--- _ _, J 507.13.2 Heavy-duty cooking appliances. The minimum Exposed flame and burners 2 net airflow for hoods, as determined by Section 507.2, used l~!?.osed c~~c~al and charbroil type l._____3.5 for heavy-duty cooking appliances shall be determined as follows: For SI: I foot= 304.8 mm. Type of Hood CFM per linear foot of hood 507.11.1 Criteria. Filters shall be of such size, type and Backs helf/pass-over 400 arrangement as will permit the required quantity of air to Double island canopy pass through such units at rates not exceeding those for (per side) 400 which the filter or unit was designed or approved Filter Eyebrow Not allowed units shall be installed in frames or holders so as to be Single island canopy 600 readily removable without the use of separate tools, unless Wall-mounted canopy 400 designed and installed to be cleaned in place and the system For SI: 1 cfm per linear foot= 1.55 Lis per linear meter. is equipped for such cleaning in place. Removable filter units shall be of a size that will allow them to be cleaned in a dishwashing machine or pot sink. Filter units shall be 507.13.3 Medium-duty cooking appliances. The mini- mum net airflow for hoods, as determined by Section 507.2, I 2009 INTERNATIONAL MECHANICAL CODE® 51

VENTILATION SECTION 403 provide the flow rates as specified in Section 403.3. The MECHANICAL VENTILATION required outdoor airflow rates specified in Table 403.3 shall be introduced directly into such spaces or into the occupied 403. l Ventilation system. Mechanical ventilation shall be pro- spaces from which air is transferred or a combination of vided by a method of supply air and return or exhaust ail: The amount of supply air shall be approximately equal to the both. amount of return and exhaust air. The system shall not be pro- 403.3 Outdoor airflow rate. Ventilation systems shall be hibited from producing negative or positive pressure. The sys- designed to have the capacity to supply the minimum outdoor tem to convey ventilation air shall be designed and installed in airflow rate determined in accordance with this section. The accordance with Chapter 6. occupant load utilized for design of the ventilation system shall not be less than the number determined from the estimated 403.2 Outdoor air required. The minimum outdoor airflow maximum occupant load rate indicated in Table 403.3. Ventila- rate shall be determined in accordance with Section 403.3. tion rates for occupancies not represented in Table 403.3 shall Ventilation supply systems shall be designed to deliver the be those for a listed occupancyclassification that is most simi- required rate of outdoor airflow to the breathing zone within lar in terms of occupant density, activities and building con- each occupiable space. struction; or shall be determined by an approved engineeting Exception: Where the registered design professional dem- analysis. The ventilation system shall be designed to supply the onstrates that an engineered ventilation system design will required rate of ventilation air continuously during the period prevent the maximum concentration of contaminants from the building is occupied, except as otherwise stated in other exceeding that obtainable by the rate of outdoor air ventila- provisions of the code. tion determined in accordance with Section 403.3, the mini- With the exception of smoking lounges, the ventilation rates mum required rate of outdoor air shall be reduced in in Table 403.3 are based on the absence of smoking in accordance with such engineered system design. occupiable spaces. Where smoking is anticipated in a space 403.2.1 Recirculation of air. The outdoor air required by other than a smoking lounge, the ventilation system serving the Section 403.3 shall not be recirculated. Air in excess of that space shall be designed to provide ventilation over and above required by Section 403.3 shall not be prohibited from being that required by Table 403.3 in accordance with accepted engi- recirculated as a component of supply air to building spaces, neering practice. except that: Exception: The occupant load is not required to be deter- I. Ventilation air shall not be recirculated from one mined based on the estimated maximum occupant load rate dwelling to another or to dissimilar occupancies. indicated in Table 403.3 where approved statistical data document the accuracy of an alternate anticipated occupant 2. Supply air to a swimming pool and associated deck density. areas shall not be recirculated unless such air is dehu- midified to maintain the relative humidity of the area 403.3.1 Zone outdoor airflow. The minimum outdoor air- al 60 percent or less. Air from this area shall not be flow required to be supplied to each zone shall be deter- recirculated to other spaces where more than I 0 per- mined as a function of occupancy classification and space cent of the resulting supply airstream consists of air air distribution effectiveness in accordance with Sections recirculated from these spaces. 403.3.1.1 through 403.3.1.3. 3. Where mechanical exhaust is required by Note bin 403.3.1.1 Breathing zone outdoor airflow. The outdoor Table 403.3, recirculation of air from such spaces airflow rate required in the breathing zone (Vi,,) of the shall be prohibited. All air supplied to such spaces occupiable space or spaces in a zone shal I be determined shall be exhausted, including any air in excess of that in accordance with Equation 4-1. required by Table 403.3. Vb,= Rj>, + R,,A, (Equation 4-1) 4. Where mechanical exhaust is required by Note g in Table 403.3, mechanical exhaust is required and where: recirculation is prohibited where more than I 0 per- A, Zone floor area: the net occupiable floor area of cent of the resulting supply airstream consists of air the space or spaces in the zone. recirculated from these spaces. P, Zone population: the number of people in the 403.2.2 Transfer air. Except where recirculation from such space or spaces in the zone. spaces is prohibited by Table 403.3, air transferred from occupiable spaces is not prohibited from serving as makeup RP People outdoor air rate: the outdoor airflow rate air for required exhaust systems in such spaces as kitchens, required per person from Table 403.3. baths, toilet rooms, elevators and smoking lounges. The R. Area outdoor air rate: the outdoor airflow rate amount of transfer air and exhaust air shall be sufficient to required per unit area from Table 403.3 . 30 2009 INTERNATIONAL MECHANICAL CODE®

VENTILATION TABLE403.3 MINIMUM VENTILATION RATES PEOPLE OUTDOOR AREA OUTDOOR AIRFLOW RATE IN AIRFLOW RATE IN BREATHING ZONE, RP BREATHING ZONE, R. DEFAULT OCCUPANT EXHAUST AIRFLOW OCCUPANCY CLASSIFICATION CFM/PERSON CFM/FT28 DENSITY #11000 FT28 RATE CFM/FT28 Correctional facilities Cells without plumbing fixtures 5 0.12 25 - with plumbing fixturess 5 0.12 25 1.0 Dining halls (see food and beverage service) - - - - Guard stations 5 0.06 15 - Day room 5 0.06 30 - Booking/waiting 7.5 0.06 50 - Dry cleaners, laundries Coin-operated dry cleaner 15 - 20 - Coin-operated laundries 7.5 0.06 20 - Commercial dry cleaner 30 - 30 - Commercial laundry 25 - 10 - Storage, pick up 7.5 0.12 30 - Education Auditoriums 5 0.06 150 - Corridors (see public spaces) - - - - Media center 10 0.12 25 - Sports locker roomsB - - - 0.5 Music/theater/dance 10 0.06 35 - Smoking loungesb 60 70 - Day care (through age 4) 10 0.18 25 - Classrooms (ages 5-8) 10 0.12 25 - Classrooms (age 9 plus) 10 0.12 35 - Lecture classroom 7.5 0.06 65 - Lecture hall (fixed seats) 7.5 0.06 150 - Art classrooms 10 0.18 20 0.7 Science laboratoriess 10 0.18 25 1.0 Wood/metal shopss 10 0.18 20 0.5 Computer lab 10 0.12 25 - Multiuse assembly 7.5 0.06 100 - Locker/dressing roomsB - - - 0.25 Food and beverage service Bars, cocktail lounges 7.5 0.18 100 - Cafeteria, fast food 7.5 0.18 100 - Dining rooms 7.5 0.18 70 - Kit hems {rsloking) b - - - 0.7 Hospitals, nursing and convalescent homes Autopsy roomsb - - - 0.5 Medical procedure rooms 15 - 20 - Operating rooms 30 - 20 - Patient rooms 25 - 10 - Physical therapy 15 - 20 - Recovery and ICU 15 - 20 - Hotels, motels, resorts and dormitories Multipurpose assembly 5 0.06 120 - Bathrooms/toilet-privates - - - 25/5or Bedroom/living room 5 0.06 10 - Conference/meeting 5 0.06 50 - Dormitory sleeping areas 5 0.06 20 - Gambling casinos 7.5 0.18 120 - Lobbies/prefunction 7.5 0.06 30 - (co11/inued} 2009 INTERNATIONAL MECHANICAL CODE® 31

VENTILATION TABLE 403.3-contlnued MINIMUM VENTILATION RATES PEOPLE OUTDOOR AREA OUTDOOR AIRFLOW RA TE IN AIRFLOW RATE IN BREATHING ZONE, RP BREATHING ZONE, R8 DEFAULT OCCUPANT EXHAUST AIRFLOW OCCUPANCY CLASSIFICATION CFM/PERSON CFM/FT28 DENSITY #11000 Fr2 • RATE CFM/FT21 Offices Conference rooms 5 0.06 50 - Office spaces 5 0.06 5 - Reception areas 5 0.06 30 - Telephone/data entry 5 0.06 60 - Main entry lobbies 5 0.06 10 - Private dwellings, single and multiple Garages, common for multiple unitsb - - - 0.75 Garages, separate for each dwellingb - - - 100 cfm per car Kitchensb - - - 25/lQOf Living areas< 0.35 ACH but not less - Based upon number of - than 15 cfm/person bedrooms. First bedroom, 2; each additional bedroom, 1 Toilet rooms and bathroomsB - - - 20/50r Public spaces Con-idors - 0.06 - - Elevator car - - - 1.0 Shower room (per shower head)8 - - - 5012or Smoking loungesb 60 - 70 - Toilet rooms - publicB - - - 50/70• Places of religious worship 5 0.06 120 - Courtrooms 5 0.06 70 - Legislative chambers 5 0.06 50 - Libraries 5 0.12 10 - Museums (children's) 7.5 0.12 40 - Museums/galleries 7.5 0.06 40 - Retail stores, sales floors and showroom floors Sales (except as below) 7.5 0.12 15 - Dressing rooms - - - 0.25 Mall common areas 7.5 0.06 40 - Shipping and receiving - 0.12 - - Smoking loungesb 60 - 70 - Storage rooms - 0.1 2 - - Warehouses (see storage) - - - - Specialty shops Automotive motor-fuel dispensing stationsb - - - 1.5 Barber 7.5 0.06 25 0.5 Beauty and nail salonsb· h 20 0.12 25 0.6 Embalming rnomb - - - 2.0 0.9 Pet shops (animal areas)b 7.5 0.18 10 Supermarkets 7.5 0.06 8 - Sports and amusement Disco/dance floors 20 0.06 100 - Bowling alleys (seating areas) 10 0.12 40 - Game arcades 7.5 0.18 20 - Ice arenas without combustion engines - 0.30 - 0.5 Gym, stadium, arena (play area) - 0.30 - - Spectalor areas 7.5 0.06 150 - Swimming pools (pool and deck area) - 0.48 - - Health club/aerobics room 20 0.06 40 - Health club/weight room 20 0.06 10 - (continued} 32 2009 INTERNATIONAL MECHANICAL CODE®

VENTILATION TABLE 403.3-contlnued MINIMUM VENTILATION RATES PEOPLE OUTDOOR AREA OUTDOOR AIRFLOW RA TE IN AIRFLOW RATE IN BREATHING ZONE, RP BREATHING ZONE, R8 DEFAULT OCCUPANT EXHAUST AIRFLOW OCCUPANCY CLASSIFICATION CFM/PERSON CFM/FT28 DENSITY #11000 FT28 RATE CFM/FT2 " Storage Repair garages. enclosed parking garagesb,d - - - 0.75 Warehouses - 0.06 - - Theaters Auditoriums (see education) - - - - Lobbies 5 0.06 150 - Stages, studios 10 0.06 70 - Ticket booths 5 0.06 60 - Transportation Platforms 7.5 0.06 100 - Transportation waiting 7.5 0.06 100 - Workrooms Bank vaults/safe deposit 5 0.06 5 - Darkrooms - - - 1.0 Copy, printing rooms 5 0.06 4 0.5 Meat processingc 15 - 10 - Pharmacy (prep. area) 5 0.18 10 - Photo studios 5 0.12 10 - Computer (without printing) 5 0.06 4 - For SI: I cubic foot per minute= 0.0004719 m 3/s, I ton= 908 kg, I cubic foot per minute per square foot= 0.00508m 3/(s · m 2), C = [(F) -32]/l.8, I square foot= 0.0929 m2• a. Based upon net occuplable floor area. b. Mechanical exhaust required end the recirculation of air from such spaces Is prohibited (see Section 403.2. l, Item 3). c. Spaces unheated or maintained below 50°F are not covered by these requirements unless the occupancy is continuous. d. Ventilation systems in enclosed parking garages shall comply wlth Section 404. e. Rates are per water closet or urinal. The higher rate shall be provided where periods of heavy use are expected to occur. such as toilets In theaters. schools and sports facllltles. The lower rate shall be permitted where periods of heavy use are not expected. f. Rates are per room unless otherwise Indicated. The higher rate shall be provided where the exhaust system Is designed to operate Intermittently. The lower rate shall be permitted where the exhaust system is designed to operate continuously during normal hours of use. g. Mechanical exhaust is required and recirculation ls prohibited except that recirculation shall be permitted where the resulting supply alrstream consists ofnot more Ll1an I 0 percent air recirculated from these spaces (see Section 403.2. I, Items 2 and 4) . h. For nail salons, the required exhaust shall include ventllatlon tables or other systems that capture the contaminants and odors at their source and are capable of exhausting a minimum of 50 cfm per station. 2009 INTERNATIONAL MECHANICAL CODE® 33

VENTILATION 403.3.1.2 Zone air distribution effectiveness. The zone outdoor air intake flow rate ( V r) shall be determined in 0 air distribution effectiveness (EJ shall be determined accordance with Sections 403. 3. 2. 3 .1 through using Table 403.3.1.2. 403.3.2.3.4. TABLE 403.3.1.2 403.3.2.3.1 Primary outdoor air fraction. The pri- ZONE AIR DISTRIBUTION EFFECTIVENESS•·b,c,d,a mary outdoor air fraction (Z) shall be determined for Air Distribution Configuration E, each zone in accordance with Equation 4-5. Ceiling or floor supply of cool air 1.0f z = voz (Equation 4-5) Ceiling or floor supply of warm air and floor return 1.0 p vpz Ceiling supply of warm air and ceiling return 0.88 where: Floor supply of warm air and ceiling return 0.7 ~, = Primary airflow: The airflow rate supplied to Makeup air drawn in on the opposite side of the room the zone from the air-handling unit at which from the exhaust and/or return 0.8 the outdoor air intake is located. It includes Makeup air drawn in near to the exhaust and/or return outdoor intake air and recirculated air from location 0.5 that air-handling unit but does not include air transferred or air recirculated to the zone by For SI: I foot= 304.8 mm, I foot per minute = 0.00506 mis, °C = [(°F) - 32]/J.8. other means. For design purposes, ~,shall be a. "Cool air" is air cooler than space temperature. the zone design primary airflow rate, except b. "Warm air" is air warmer than space temperature. for zones with variable air volume supply and c. "Ceiling" includes any point above the breathing zone. ~, shall be the lowest expected primary air- d. "Floor" includes any point below the breathing zone. flow rate to the zone when it is fully occupied. e. "Makeup air" is air supplied or transferred to a zone to replace air removed from the zone by exhaust or return systems. 403.3.2.3.2 System ventilation efficiency. The sys- f. Zone air distribution effectiveness of 1.2 shall be permitted for systems with tem ventilation efficiency (E.) shall be determined a floor supply of cool air and ceiling return, provided that low-velocity dis- using Table 403.3.2.3.2 or Appendix A of ASHRAE placement ventilation achieves unidirectional flow and thermal stratifica- tion. 62.1. g. Zone air distribution effectiveness of 1.0 shall be permitted for systems with TABLE 403.3.2.3.2 a ceiling supply of warm air, provided that supply air temperature is less than SYSTEM VENTILATION EFFICIENCY•·b 15°F above space iemperature and pmv lded that Lhe 150 foot-per-minute supply air jet reaches lo within 41/ 2 ff.el af floor lcv I. Max(Z,J Ev 403.3.1.3 Zone outdoor airflow. The zone outdoor air- :::; 0.15 1 flow rate ( V J, shall be determined in accordance with 0 Equation 4-2. :::; 0.25 0.9 :::; 0.35 0.8 voz = vbz E, (Equation 4-2) :::; 0.45 0.7 403.3.2 System outdoor airflow. The outdoor air required :::; 0.55 0.6 to be supplied by each ventilation system shall be deter- :::; 0.65 0.5 mined in accordance with Sections 403.3.2.1 through 403.3.2.3 as a function of system type and zone outdoor air- :::; 0.75 0.4 flow rates. >0.75 0.3 403.3.2.1 Single zone systems. Where one air handler a. Max (Z) L~ Ille largest value of ZP calculated using Equation 4-5 among all supplies a mixture of outdoor air and recirculated return the zones SPrvrd by the systr m. air to only one zone, the system outdoor air intake flow b. Interpolating between table values shall be permitted. rate ( V0 r) shall be determined in accordance with Equa- 403.3.2.3.3 Uncorrected outdoor air intake. The tion 4-3. uncorrected outdoor air intake flow rate ( V,,,) shall be (Equation 4-3) determined in accordance with Equation 4-6. 403.3.2.2 100-percent outdoor air systems. Where one Vo,,= D"[,allzonesR~, + LallzonesR,,A, (Equation 4-6) air handler supplies only outdoor air to one or more zones, the system outdoor air intake flow rate ( V,,r) shall where: be determined using Equation 4-4. D Occupant diversity: the ratio of the system population to the sum of the zone populations, (Equation 4-4) determined in accordance with Equation 4-7. 403.3.2.3 Multiple zone recirculating systems. Where p one air handler supplies a mixture of outdoor air and D= ~ (Equation 4-7) recirculated return air to more than one zone, the system !: ull b>n"' ~ 34 2009 INTERNATIONAL MECHANICAL CODE®

VENTILATION where: SECTION 405 SYSTEMS CONTROL Ps = System population: The total number of occu- pants in the area served by the system. For de- 405.1 General. Mechanical ventilation systems shall be pro- sign purposes, P, shall be the maximum vided with manual or automatic controls that will operate such number of occupants expected to be concur- systems whenever the spaces are occupied. Air-conditioning rently in all zones served by the system. systems that supply required ventilation air shall be provided with controls designed to automatically maintain the required 403.3.2.3.4 Outdoor air intake flow rate. The out- outdoor air supply rate during occupancy. door air intake flow rate ( V0 ,) shall be determined in accordance with Equation 4-8. SECTION 406 v = VOi/ (Equation 4-8) VENTILATION OF UNINHABITED SPACES ot Ev 406.1 General. Uninhabited spaces, such as crawl spaces and 403.4 Exhaust ventilation. Exhaust airflow rate shall be pro- attics, shall be provided with natural ventilation openings as vided in accordance with the requirements In Table 403.3. required by the International Building Code or shall be pro- Exhaust makeup air shall be permitted to be any combination vided with a mechanical exhaust and supply air system. The of outdoor air, recirculated air and transfer air, except as limited mechanical exhaust rate shall be not less than 0.02 cfm per in accordance with Section 403.2. square foot (0.00001 m3/s. m2) of horizontal area and shall be automatically controlled to operate when the relative humidity 403.5 System operation. The minimum flow rate of outdoor in the space served exceeds 60 percent. air that the ventilation system must be capable of supplying during its operation shall be permitted to be based on the rate per person indicated in Table 403.3 and the actual number of occupants present. 403.6 Variable air volume system control. Variable air vol- ume air distribution systems, other than those designed to sup- ply only 100-percent outdoor air, shall be provided with controls to regulate the flow of outdoor air. Such control system shall be designed to maintain the flow rate of outdoor air at a rate of not less than that required by Section 403.3 over the entire range of supply air operating rates. 403.7 Balancing. The ventilation air distribution system shall be provided with means to adjust the system to achieve at least the minimum ventilation airflow rate as required by Sections 403.3 and 403.4. Ventilation systems shall be balanced by an appmved method. Such balancing shall verify that the ventila- tion system is capable of supplying and exhausting the airflow rates required by Sections 403.3 and 403.4. SECTION 404 ENCLOSED PARKING GARAGES 404. t Enclosed parking garages. Mechanical ventilation systems for enclosed parking garages shall be permitted to operate intermittently where the system is arranged to operate automatically upon detection of vehicle operation or the pres- ence of occupants by appmved automatic detection devices. 404.2 Minimum ventilation. Automatic operation of the sys- tem shall not reduce the ventilation airflow rate below 0.05 cfm per square foot (0.00025 m3/s · m2) of the floor area and the sys- 1 tem shall be capable of producing a ventilation airflow rate of 0.75 cfm per square foot (0.0038 m 3/s · m 2) of floor area. 404.3 Occupied spaces accessory to public garages. Con- necting offices, waiting rooms, ticket booths and similar uses that are accessory to a public garage shall be maintained at a positive pressure and shall be provided with ventilation In accordance with Section 403.3. 2009 INTERNATIONAL MECHANICAL CODE® 36