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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.
1 When the vent pipe is too long or located in a cold space, the water vapors fromâ¦. 2  Your Sewer Line Matters Long ago, there was no indoor plumbing, so homeowners and builders and buyers didn't have to worry about sewage.rapping the vent pipe with insulation and putting a tin can over the exterior pipe is a clever solution! I think a better looking, and more permanent solution would be to install a frostless vent cap or flashing. (sometimes called roof caps at plumbing wholesale shops) on the vent pipe.