4 in. x 25 ft. Insulated Flexible Duct R4.2 with Metalized Jacket

- Flexible length 25ft for exhaust fan blower / inline fan
- Double-layer aluminum foil,Flame-retardant coating from -22 to 266 Fahrenheit
- Perfect for Heating Ventilation & Air Conditioning (HVAC)
- Quick and easy to set up.