Majestic 4-inch Uninsulated Flex Duct For Outside Air

The Majestic 4-Inch Uninsulated Flex Duct for Outside Air, Model UD4, is a genuine Majestic venting accessory designed for use with compatible Majestic wood-burning fireplaces. This 4-inch flexible outside-air duct helps route combustion air from the exterior of the home to the fireplace, supporting proper fireplace installation and operation.

The UD4 includes two 42-inch sections of uninsulated flex duct, providing a total of 84 inches of flexible ducting. Its flexible construction allows the duct to be routed through framing and around common installation obstacles, making it a practical choice for new fireplace installations or replacement applications where an uninsulated outside-air connection is specified.