4600 BAKER DR 2025-07-17 - Laserfiche WebLink

EXHAUST SYSTEMS with a backdraft damper,and shall be independent of all other 6. The exhaust fan motor shall be located outside of the exhaust systems. airstream. Exceptions: 7. The exhaust fan shall run continuously, and shall be 1. In other than Group I-1 and I-2, where installed in connected to a standby power source. accordance with the manufacturer's instructions and 8. Exhaust fan operation shall be monitored in an where mechanical or natural ventilation is otherwise approved location and shall initiate an audible or provided in accordance with Chapter 4, listed and visual signal when the fan is not in operation. labeled ductless range hoods shall not be required to 9. Where the exhaust rate for an individual kitchen discharge to the outdoors. exceeds 400 cfm(0.19 m3/s)makeup air shall be pro- 2. Ducts for domestic kitchen cooking appliances vided in accordance with Section 505.2. equipped with downdraft exhaust systems shall be 10. A cleanout opening shall be located at the base of the permitted to be constructed of Schedule 40 PVC shaft to provide access to the duct to allow for clea- pipe and fittings provided that the installation com- rout and inspection. The finished openings shall be plies with all of the following: not less than 12 inches by 12 inches(305 mm by 305 2.1.The duct shall be installed under a concrete mm). slab poured on grade. 11. Screens shall not be installed at the termination. 2.2.The underfloor trench in which the duct is 12. The common multistory duct system shall serve only NMM installed shall be completely backfilled with kitchen exhaust and shall be independent of other sand or gravel. exhaust systems. 2.3.The PVC duct shall extend not more than 1 505.4 Other than Group R.In other than Group R occupan- inch (25 min) above the indoor concrete cies, where domestic cooking appliances are utilized for floor surface. domestic purposes, such appliances shall be provided with .•,•2.4. The PVC duct shall extend not more than 1 domestic range hoods.Hoods and exhaust systems shall be in inch (25 mm) above grade outside of the accordance with Sections 505.1 and 505.2. building. 2.5.The PVC ducts shall be solvent cemented. SECTION 506 505.2 Makeup air required. Exhaust hood systems capable COMMERCIAL KITCHEN HOOD VENTILATION of exhausting in excess of 400 cfin (0.19 m3/s) shall be pro- SYSTEM DUCTS AND EXHAUST EQUIPMENT vided with makeup air at a rate approximately equal to the 506.1 General. Commercial kitchen hood ventilation ducts exhaust air rate. Such makeup air systems shall be equipped and exhaust equipment shall comply with the requirements of with a means of closure and shall be automatically controlled this section. Commercial kitchen grease ducts shall be to start and operate simultaneously with the exhaust system. designed for the type of cooking appliance and hood served. 505.3 Common exhaust systems for domestic kitchens 506.2 Corrosion protection. Ducts exposed to the outside located in multistory structures. Where a common multi- atmosphere or subject to a corrosive environment shall be story duct system is designed and installed to convey exhaust protected against corrosion in an approved manner. from multiple domestic kitchen exhaust systems, the con- struction of the system shall be in accordance with all of the 506.3 Ducts serving Type I hoods. Type I exhaust ducts following: shall be independent of all other exhaust systems except as 1. The shaft in which the duct is installed shall be con- Provided in Section 506.3.5. Commercial kitchen duct sys- structed and fire-resistance rated as required by the tems serving Type I hoods shall be designed,constructed and International Building Code. installed in accordance with Sections 506.3.1 through 506.3.13.3. 2. Dampers shall be prohibited in the exhaust duct, 506.3.1 Duct materials.Ducts serving Type I hoods shall except as specified in Section 505.1. Penetrations of be constructed of materials in accordance with Sections the shaft and ductwork shall be protected in accor- 506.3.1.1 and 506.3.1.2. dance with Section 607.5.5,Exception 2. 3. Rigid metal ductwork shall be installed within the 506.3.1.1 Grease duct materials.Grease ducts serving shaft to convey the exhaust. The ductwork shall be Type I hoods shall be constructed of steel having a min- constructed of sheet steel having a minimum thick- imum thickness of 0.0575 inch (1.463 mm) (No. 16 ness of 0.0187 inch(0.4712 mm)(No.26 gage)and in gage) or stainless steel not less than 0.0450 inch (1.14 accordance with SMACNA Duct Construction Stand- mm)(No. 18 gage)in thickness. arcs. Exception:Factory-built commercial kitchen grease 4. The ductwork within the shaft shall be designed and ducts listed and labeled in accordance with UL 1978 installed without offsets. and installed in accordance with Section 304.1. 5. The exhaust fan motor design shall be in accordance 506.3.1.2 Makeup air ducts. Makeup air ducts con- with Section 503.2. necting to or within 18 inches (457 mm) of a Type 1 2015 INTERNATIONAL MECHANICAL CODE 51