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 outside air
• Includes two 42" (1065mm) sections

Compatible with the following Monessen appliances

• BUF Exacta Vent-Free Circulating Firebox
• LCUF Lo-Rider Clean Face Firebox 
• Lo-Rider See-Through Clean Face Firebox