This Imperial 4" x 25FT Insulated Air Intake Duct is a 2-ply design to accommodate any wood stove where a 4” intake is required and will meet UL 181 standards for Class 1 installations.

Compatible with Drolet, Englander, Century, J.A. Roby and any other wood stoves or HVAC systems that have a 4” air intake requirement.

The 2-ply polyester laminated inner core provides outstanding resistance and durability, while the fiberglass reinforced metalized outer jacket is extremely strong and will not unravel