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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.
Properly connecting a dryer to an outside vent terminal is not as simple as it might seem. You need to be concerned with the total length of run of the pipe, the type of pipe you use, how many bends are in the pipe, and the design/shape of vent terminal at the end of the pipe.se the tables below to calculate how far your vent can be from the dryer. Pay attention to the type of pipe you have and the vent configuration! Vent cap with wide four inch opening or mini-louvers and smooth metal pipe. 1  Total Pipe length can be 64 feet with No bends.