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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.
Attach the vent cover to the vent pipe, if your kit comes with one. The vent pipe should be the same length as the original. Slide the new vent into the vent hole. Look at the screw holes. If they don't line up with the original screw holes, you will need to drill new ones.