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• <br /> L. Multiple Hood Venting (506.3.5): <br /> 1. Number of hoods vented by a single duct system: Proposed: <br /> A single-duct system may serve more than one hood located in the same story of the building, <br /> provided that the interconnecting ducts do not penetrate any fire resistance rated construction and <br /> are located in adjoining rooms; and the grease duct system does not serve a solid fuel-fired <br /> appliance. <br /> 2. An unlisted hood outlet shall serve not more than a 12-foot section of hood. <br /> M. Provide seismic restraint vertical support and attachment details for the hood; shall be prepared <br /> by someone knowledgeable in structural engineering. (IMC 301.15, IBC 1613, ASCE7-05) Hoods <br /> and equipment over 400 pounds require calculations and details for review. <br /> N. Additional Information—Type I Hood Only: <br /> 1. Grease filters shall be installed at a minimum 45 degrees angle and <br /> equipped with drip tray and gutter beneath lower edge of filters. Proposed: degrees <br /> 2. Distance between lowest edge of grease filters and cooking surface of: <br /> Grill, fryer, exposed flame shall not be not be less than 2 ft. Proposed: ft. <br /> Exposed charcoal, charbroil shall be not less than 3 '/ft. (507.11) Proposed: ft. <br /> 3. Type I hood and duct shall have clearances from construction of: Proposed: in. <br /> GWB on metal stud (minimum 3" clearance required) (506.3.6; 507.2.6) <br /> GWB on wood stud (minimum 18" clearance required) (506.3.6; 507.2.6) <br /> PROTECTED <br /> UNPROTECTED (Combustible Construction) (With 1-hour Fire-Rated <br /> Material and Stud Construction) <br /> Hood Min. Req. 18 in. Proposed /9 of in. Min. Req. 3 in. Proposed 3,Ar in. <br /> Duct Min. Req. 18 in. Proposed in. Min. Req. 3 in. Proposed in. <br /> 4. Hoods less than 12 inches from ceilings or walls shall be flashed,solidly. <br /> 5. All joints and seams shall be made with continuous liquid-tight weld or braze made on the external <br /> surface of the duct system. Vibration insulation connector may be used provided it consists of <br /> noncombustible packing in a metal sleeve joint. (506.3.2, 506.3.2.4) Joints shall be smooth and <br /> accessible for inspection. (506.3.2.5)A light test shall be performed. <br /> 6. Exhaust fans used for discharging grease exhaust shall be positioned so that the discharge will not <br /> impinge on the roof. The fan shall be provided with an adequate drain opening at the lowest point to <br /> permit drainage of grease to a suitable collection device. (506.5.2) <br /> 7. Fire Suppression System Fire Suppression System shall be per Fire Code. Portable extinguisher <br /> shall also be provided per Fire Code. Provide automatic shutoff for make-up air, exhaust system, <br /> and appliances when suppression system is activated. Dependent on suppression agent and <br /> manufacturer's requirements. Separate permit is required. <br /> 8. Performance test certificate of the hood system shall be provided to owner before final approval. <br /> Test shall verify property operation, the rate of exhaust, makeup air, capture and containment <br /> performance of the exhaust at normal operating conditions. (507.6) <br /> 9. A pollution-control unit may be required for side-wall terminations. (506.3.13.2) <br /> References: <br /> 1 —International Mechanical Code(2015) <br /> 2—International Building Code(2015) <br /> 3—International Fire Code(2015) <br /> 4—International Fuel Gas Code(2015) <br />