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• <br /> 1 3. All connectors shall be as short and straight as <br /> possible. A water heater shall be located as close as <br /> 2 practicable to the venting system. The connector <br /> shall be not longer than 75 per cent of the portion of <br /> 3 the venting system above the inlet connection unless <br /> a part of an approved engineered venting system. <br /> 4 <br /> 4. A connector to a masonry chimney shall extend <br /> 5 through the wall to the inner face of liner but not <br /> beyond and shall be firmly cemented to masonry. A <br /> 6 thimble may be used to facilitate removal of the <br /> connector for cleaning, in which case the thimble <br /> 7 shall be permanently cemented in place. Connectors <br /> shall not pass through any floor or ceiling. <br /> 8 <br /> 5. A draft regulator shall be installed in the connector <br /> 9 serving a liquid fuel burning water heater unless the <br /> water heater is approved for use without a draft <br /> 10 regulator. A draft regulator when used shall be <br /> installed in the same room or enclosure as the water <br /> 11 heater in such a manner that no difference in <br /> pressure between air in the vicinity of the regulator <br /> 12 and the combustion air supply will be permitted. <br /> 13 Section 2324 - Mechanical Draft Systems <br /> 14 (a) Forced or Induced Draft Systems. Water heaters may be <br /> vented by means of a mechanical draft system of either <br /> 15 forced or induced draft design. <br /> 16 (b) Positive Pressure Systems. Forced draft systems and all <br /> portions of induced draft systems under positive pressure <br /> 17 during operation shall be designed and installed so as to be <br /> gas tight or as to prevent leakage of combustion products <br /> 18 into a building. <br /> 19 (c) Interconnected Systems. Vent connectors serving gas <br /> appliances vented by natural draft shall not be connected <br /> 20 into any portion of a mechanical draft system operating <br /> under positive pressure. <br /> 21 <br /> (d) Interlock Controls. When a mechanical draft system is <br /> 22 employed, provision shall be made to prevent the flow of gas <br /> to the main burners when the draft system is not performing <br /> 23 so as to satisfy the operating requirements of the water <br /> heater for safe performance. <br /> 24 <br /> (e) Exit Terminals. The exit terminals of mechanical draft <br /> 25 systems shall be located not less than 12 inches (12") from <br /> any opening through which combustion products could enter <br /> 26 the building, nor less than 2 feet (2') from an adjacent <br /> building, not less than 7 feet (7') above grade when located <br /> 27 adjacent to public walkways. <br /> 28 Section 2325 - Venting through Ventilating Hoods and <br /> Exhaust Systems <br /> 29 <br /> (a) Commerical Applications. Ventilating hoods and exhaust <br /> 30 systems may be used to vent gas-burning water heaters <br /> installed in commercial applications. <br /> 31 <br /> (b) Dampers Prohibited. When automatically operated water <br /> 32 heaters are vented through natural draft ventilating hoods, <br /> dampers shall not be installed in the ventilating system. <br /> - 24 - <br />