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FC § 3104.15.2
Gas, liquid and solid fuel-burning equipment designed to be vented shall be vented to the outdoors in accordance with the construction codes, including the Mechanical Code and the Fuel Gas Code. Such vents shall be equipped with approved spark arresters when required. Where vents or flues are used, all portions of the membrane structure shall be not less than 12 inches (305 mm) from the flue or vent.
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