There is a newer version of the New York Consolidated Laws
2006 New York Code - Gas Vent Height And Locations.
§ 27-888 Gas vent height and locations. Gas vents shall extend at least two feet above the highest construction, such as a roof ridge, parapet wall, or penthouse, within ten feet of the vent outlet whether the construction is on the same building as the chimney or on another building. However, such constructions do not include chimneys or other vents, or open structural framing. The vent shall be as high as such construction which is located beyond ten feet from the vent and up to and including the distance determined by the following formula: D = 2(sq.rt.)A where: D = Distance in ft., measured from the center of the vent outlet to the nearest edge of the construction. A = Free area, in sq. in., of vent flue space. Vents shall be subject to the following additional requirements: (a) No gas vent shall terminate less than five feet in vertical height above the highest connected equipment draft hood outlet or flue collar. (b) No type B-W gas vent serving a vented recessed heater shall terminate less than twelve feet in vertical height above the bottom of the heater. (c) All gas vents shall terminate in an approved vent or cowl, which shall prevent down drafts and prevent rain and debris from entering the vent.
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