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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.
See our section on How to Install Pellet Vent Pro Chimney Systems and Pellet Vent Pro Installation Instructions. 1  Start first by determining what size of chimney your pellet stove requires, pellet vent pipe is available in 3 and 4 diameters. This information is in the instruction manual of your pellet stove.