Monessen 4" Uninsulated Flex Duct For Outside Air btu52500 (E) - Top Width -

(E) - Top Width - 66 3/4"

Durable and stately forged iron construction

Cast iron arch doors

Sized to fit in a stud wall

Monessen 4" Uninsulated Flex Duct For Outside Air btu52500 (E) - Top Width -Uninsulated Flex Duct The Monessen UD4 4 inch Uninsulated FlexDuct for Outside Air is just one of the many options offered by Monessen. This particular FlexDuct is 4" (100 mm) in diameter. The model number refers to two 42" (1065 mm) sections. The FlexDuct is uninsulated, so it won't be moving incredibly hot air around. It's specifically designed to work well with outside air. Features Weighs 3 pound 4" (100mm) in diameter Uninsulated flex duct for