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0 <br />L. Multiple Hood Venting (606.3.5): <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 301.16, 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 e <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: 3 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) <br />(With 1-hour Fire -Rated <br />Material and Stud Construction) <br />Hood Min. Req. 18 in. Proposed in. <br />Min. Req. 3 in. Proposed 3 in. <br />Duct Min. Req. 18 in. Proposed in. <br />Min. Req. 3 in. Proposed 3 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 />