Building Services & Code Enforcement 4 Use Applications: GREASE DUCT (IMC 506.3): SUPPRESSION SYSTEM (IMC SECTION 509, IBC 904.2.1): 451 South State Street, Room 215 Extra Heavy Duty (IMC 507.2.4): Type 1 hoods 1 Provide the grease duct size. Note PO Box 145490 over these appliances shall not cover other the design air velocity. 1 Provide plans and details for Type 1 hood Salt Lake City, UT 84114 appliances that require fire extinguishing 2 Provide the type of the joint seams approved automatic fire suppression www.slc.gov/buildingservices equipment and such hoods shall discharge and connections to be used for the system complying with the IBC and 801-535-6000 to an independent exhaust system. installation of the grease duct to the IFC. Include shutdown devices. Updated 10-2012 Fuel-burning Appliances (IMC 507.3): Type 1 hood and exhaust fan. 2 A balance report, prepared by a qualified third Provisions shall be made to prevent the hood 3 Show the grease duct exhaust fan to be party, shall be presented to SLC’s inspector. system from interfering with the normal a minimum 10’ above grade. Verify that operation of the vents for these appliances. Commercial Kitchen the location will not be a public nuisance Type 2 Hoods 5 Materials (IMS 507.5): Type 1 hoods or create problems in general due to the Hoods (Types 1 + 2) shall be constructed of steel that is a location, direction, or nature of the exhaust. IMC SECTION 507.2.2 “SHALL BE INSTALLED minimum .043 inch think or stainless 4 Show the exhaust fan termination to be a OVER COOKING OR DISHWASHING Design Guidance steel that is minimum .037 inch thick. minimum 40” above the roof. Show how APPLIANCES THAT PRODUCE HEAT, STEAM 6 Supports shall be noncombustible one side is hinged with a flexible electrical OR PRODUCTS OF COMBUSTION AND and capable of supporting the hood, connector for inspection and cleaning. DO NOT PRODUCE GREASE OR SMOKE 2009 International Building adjacent ductwork, the effluent load and 5 Provide a “light test” for grease duct prior SUCH AS STEAMERS, KETTLES, PASTA the possible weight of the personnel to enclosing or concealing. IMC 506.3.3.1 COOKERS, AND DISHWASHING MACHINES. and Mechanical Code working in or on the hood. IMC 507.6 and Commentaries 6 Provide specifications, installation details 1 Exceptions 7 Joints, seams, penetrations (IMC 507.7): and current ICC Evaluation Report for Under counter type commercial This is a design review checklist for code External hood joints shall be made with a the grease duct wrap system. This wrap dishwashing machines requirements for commercial kitchen hoods continuous liquid-tight weld or braze to the shall extend from 18 inches below any Dishwashing machines that have including grease ducts and their connections to lower outermost perimeter of the hood. combustible truss or wood joist to a point a built-in exhaust system. hood and roof exhaust fans, exhaust fan details, Internal joint, seams, penetrations, filter 18” above the surface of the roof covering make-up air details and suppression systems, support frames, and other appendages or provide an 18” clearance to combustible Light duty electric convection, bread, etc. Please ensure the following items are fully shall not be required to be brazed or material for the same distance or provide a retherm, or microwave over. addressed in the design documents. Also note welded. They shall be sealed grease tight. noncombustible 1-hr fire-rated shaft with Toaster, steam tables, popcorn poppers, that this list is a minimum scope of what we will Cleaning, grease gutters (IMC 507.8): The a gyp board and 3” minimum clearance. hot dog cookers, coffee makers, rice be reviewing. Additional or result and issues 8 hood shall be designed to allow thorough Address duct grease accumulation and cookers, and holding/warming ovens. may arise as these items are addressed. 7 cleaning of the entire hood. Grease gutters cleanout per IMC 506.3.6, 7, 8, 9. 2 Materials should be steel not less than shall drain to an approved collection Address the grease duct enclosures per .030 (22 gauge), stainless steel not less receptacle that is also easily cleaned. 8 Type 1 Hoods IMC 506.3.10 (including exceptions). that .024 (24 gauge), copper weighing 9 Clearances (IMC 507.9): Provide a minimum not less that 24 oz. per sq ft, or of any IMC SECTION 507 “...SHALL BE INSTALLED 18 inch clearance from the Type 1 grease MAKEUP AIR (IMC SECTION 508): other approved material. IMC 507.5. WHERE COOKING APPLIANCES PRODUCE hood to any combustible material. Clearance 1 Provide exhaust and makeup air 3 Supports shall be noncombustible GREASE OR SMOKE, SUCH AS GRIDDLES, is not required for gypsum board attached calculations for the kitchen or the entire and capable of supporting the hood, FRYERS, BOILERS, OVERS, RANGES, to noncombustible structures provided space as applicable. Include all sources adjacent ductwork, the effluent load and SMOKERS AND WOK RANGES”. THIS that a smooth, cleanable, nonabsorbent of exhaust air and make-up air. the possible weight of the personnel INCLUDES CONVEYER AND DECK-STYLE and noncombustible material is applied Provide an interlock device between all working in or on the hood. IMC 507.5. PIZZA OVENS (IMC COMMENTARY). between the gyp board and the hood. 2 grease hoods and make-up air units to insure Joints, seams, and penetrations shall be This material shall extend 18” minimum 4 Show / note all cooking equipment that simultaneous operation when active. constructed as set forth in IMC Ch. 6, shall 1 beyond all sides or edges of the hood. must be provided with a Type 1 hood. Provide a heat sensor or other device to be sealed on the interior of the hood and Show the location of the Type 1 hood in 3 UL listing for the Type 1 kitchen grease 10 insure the automatic operation of both the provide a smooth surface that is readily 2 relation to the kitchen ceiling and walls. hoods to be installed. See IMC 507.1. kitchen hood and the make-up air systems cleanable and water tight. IMC 507.7.2. If any portion of the hood penetrates the upon activation of the cooking devices. 3 Provide a heat sensor or other device to insure ceiling, wall or furred space it shall be the automatic operation of both the kitchen enclosed from the point of penetration 4 Makeup air intake opening locations hood and the make-up air systems upon to the outlet terminal. IMC 506.3.10. shall comply with IMC 401.4 activation of the cooking devices. IMC 507.2.1.1. 11 Provide performance, capture, & containment 5 Makeup air temperature shall not vary from test for the Type hood system. The the conditioned space by more than 10°F. permit holder shall provide the necessary 6 Compensating hoods shall bear labels test equipment and devices required stating their air volume requirements. to test the equipment. IMC 507.16. 7 A balance report, prepared by a qualified third party, shall be presented to SLC’s inspector.