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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.
If your exhaust system does not have a 6â diameter, you can insert a stainless liner with a 6â diameter inside the exhaust system. Non-EPA stoves often have a flue outlet that varies from 6â to 8â. Insert a liner with a diameter equal to the stoveâs flue outlet. 5. If you have verified points 1 through 4 and your stove works fine, but still does not heat enough, you may be asking your stove more than what it can realistically give you.