Deflect-O Duct increaser/reducer to connect a piece of 4 inch. Duct to a piece of 3 inch duct. The duct connecter works great on many bathroom fan installations.
- Plastic construction for durability
- Connects 3 in. duct to 4 in. duct quickly, easily
- Ideal for bathroom fan exhaust applications
- Seal joined edges with duct tape for increased efficiency