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1 Connectors used for gas water heaters having draft hoods may be <br /> constructed of non-combustible materials having resistance to corrosion <br /> 2 not less than that of galvanized sheet steel and be of a thickness not less <br /> than that specified in Section 2323 (b) or they may be of Type B or Type L <br /> 3 vent material. <br /> 4 Section 2315 - Location and Support of Venting System <br /> 5 Combustion products, vents, vent connectors, or exhaust ducts shall not <br /> extend into or through any air duct. <br /> 6 <br /> Exception: A venting system may pass through a combustion air duct. <br /> 7 <br /> The base of every vent which extends to the ground shall rest on a solid <br /> 8 masonry or concrete base not less than two inches (2") in thickness. The <br /> base of every vent which is not self-supporting, shall rest on a firm metal <br /> 9 or masonry support. <br /> 10 No water heater shall be vented into a fireplace or into a chimney serving <br /> a fireplace. <br /> 11 <br /> All venting systems shall be adequately supported for the weight and the <br /> 12 design of the material used. <br /> 13 Section 2316 - Length, Pitch and Clearance <br /> 14 (a) Vent Offsets: Except as provided for in Section 2312 (d), <br /> every gravity type vent shall extend in a general vertical <br /> 15 direction having no offsets greater than 45 degrees from <br /> vertical except when approved by the Building Official. A <br /> 16 vent may have one offset of not more than 60 degrees from <br /> the vertical. <br /> 17 <br /> (b) Every offset shall be supported for its weight and shall be <br /> 18 installed to maintain proper clearance, to prevent physical <br /> damage and to prevent separation of the joints. <br /> 19 <br /> (c) Any angle greater than 45 degrees from the vertical is <br /> 20 considered horizontal. The total horizontal run of a vent, <br /> plus the horizontal vent connection, shall be not greater <br /> 21 than 75 per cent of the vertical height of the vent. <br /> 22 (d) Rise: Every vent connector which is a part of a gravity-type <br /> venting system shall have a continuous rise of not less than <br /> 23 one-fourth inch (Ye") per foot of length measured from the <br /> appliance vent collar to the vent. <br /> 24 <br /> (e) Clearance: Single wall metal vent connectors, where <br /> 25 permitted to be used by Section 2314, shall be provided with <br /> clearances from combustible material of not less than six <br /> 26 inches (6"). <br /> 27 Section 2317 - Vent Termination <br /> 28 (a) General: Vents shall extend above the roof surface, through <br /> a flashing, and terminate in an approved or listed vent cap <br /> 29 which shall be installed according to its listing and <br /> manufacturer's instructions. <br /> 30 (b) Gravity-type: No gravity-type venting system, other than a <br /> 31 venting system which is an integral part of a listed water <br /> heater shall terminate less than five feet (5') above the <br /> 32 highest vent collar which it serves. <br /> - 20 - <br />