Monessen 4" Uninsulated Flex Duct For Outside Air btu52500 the specialty sets are crafted

the specialty sets are crafted to meet the needs of specific fireplace types

Sized to fit in a stud wall

1 bag recommended for most burners

Variable flame height remote control with standing pilot (-17)

Monessen 4" Uninsulated Flex Duct For Outside Air btu52500 the specialty sets are craftedUninsulated 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