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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.
One is just the size of the pipe. Your pellet stove had 3â³ or 4â³ pipe Iâd think and woodstoves nowadays use mostly 6â³ ( but whatever yours is Iâd be pretty sure itâs not as small as the pellet pipe) You need to use the same size connector pipe as the collar size on the stove.