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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.
To install a dryer vent hose, a professional will need 4-inch rigid metal duct, 4-inch elbows, a duct cap, pipe straps, a vent cap, foil tape, and exterior caulk. The installation will also require the use of a caulk gun, screwdriver, a drill, a hole saw, and tin snips.