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, 4. 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 & <br /> accessible for inspection. (506.3.2) <br /> 5. 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 /> 6. Fire Suppression System. Fire Suppression System shall be per Fire Code. Portable fire extinguisher <br /> shall also be provided per Fire Code. Provide automatic shutoff for make-up air, exhaust system and <br /> appliances when suppression system is activated. Dependant on suppression agent & manufacturer's <br /> requirements. (Sec 5.10.7) <br /> 7. Performance test certificate of the hood system shall be provided to owner before final approval. Test <br /> shall verify proper operation, the rate of exhaust, makeup air, capture and containment performance of <br /> the exhaust at normal operating conditions. (507.16) <br /> References: <br /> 1) International Mechanical Code 2012 <br /> 2) International Building Code 2012 <br /> 3) International Fire Code 2012 <br /> 4) International Fuel Gas Code 2012 <br /> Revised 10/08/2013 "f„ <br />