Features:
4" (10.2cm) flexible insulated duct tubing intended for use with the Return Vent System
Will connect to the exhaust end of rough-in box and carry the heated air inside the walls or ceiling to vent to another area in the home
UL Listed to meet most code requirements
Dimensions: 4" (10.2cm) Inside Diameter & 25' (7.6m) in Length
Compatibility: Return Vent System