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air. Shall further meEt requirements of SBC1303, 7409 as are applicable. <br />Sec. 7403 SBC <br />89. Type B gas vents, shall be round in physical shape except as approved <br />for B-W vents. For further specifications see Sec. 7404 of SBC <br />90. When two or more appliances are connected to a common vent or chimney, <br />the effective area of each vent, connector sha'- be not less than the area <br />_f the applicant, draft hood outlet. Sec 7407-c-SBC <br />91. Vent connectors shall be firmly attached to draft hood outlets by <br />sheet metal screws or other approved means. Joints of other than listed <br />Type B gas vent materials shall be securely fastened by sheet metal screws. <br />Sec. 7407 SBC <br />92. Single wall metal pipe used as a vent connector shall not pass through <br />any floor or ceiling. Sec. 7407 SBC <br />93. In an individual duct system, such duct shall be provided with a volume <br />damper with substantial mounting and positive locking device. Sec. 7508 <br />SBC <br />94. In a trunk system, each branch duct shall be provided with a splitter <br />damper where it leaves the main trunk duct, and with additional aplitter <br />dampers it again divided. All dampers shall be provided with positive <br />locking devices. Sec. 7508 SBC <br />95. Warm ai-I supply ducts shall not be installed for the purpose of heating <br />attached pt-vate garages from any forced air system serving habitable <br />areas. Sec.. 7508 SBC <br />96. Supply registers shall be securely fastened to connecting pipe. Return <br />air registers shall have a free area at least equal to the free area of the <br />ducts to which they are connected. Sec. 7509-7510 SBC <br />97. In residential installations the fan or blower housing shall not be <br />directly connected with metal either to the furnace casing or to the return <br />air piping. Canvas strips may be used to make these connections. Motors <br />shall be mounted in such a way that vibration will not be transmitted to <br />duct work or equipment. Sec. 7518 SBC <br />98. Residential ventilation, all ducts, (range hood ventilation) shall be <br />galvanized iron of not less than #28 gauge. All seams in the duct system <br />shall be tight. Pressure sensitive tape may be used (if approved). <br />Back draft dampers shall be provided near the outlet of the duct. <br />1/2" mesh screen shall be installed at each exhaust outlet. <br />Ducts passing through unheated spaces shall be insulated with a minimum of <br />one inch of fiber glass insulation. <br />Ducts located in a heated space shall be insulated with one inch of fiber <br />glass insulation for a distance of three feet from the duct outlet. Sec. <br />7715 SBC <br />