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When a vent is less than 10 feet high, the vent should be at least as large as the flue collar outlet.b) Vents for draft hoods or flue collars 12 inches in diameter or less should NOT be reduced more than one pipe size.
Plumbing must comply with all building and water supply regulations for your area.A) Install the drain pipe so that it is 8 inches (20.3 cm) from the center of the pipe off the floor or less, BuT noT MorE THAn 8 InCHES. See figure below. A wall-mounted drain pipe is shown.