3 inch to 4 inch Plastic Duct Increaser – Item #235
The Lambro 3 inch to 4 inch plastic duct connector is ideal for bath fan exhaust installations. Used to increase the duct diameter size from the bath fan 3 inch exhaust port to the 4 inch duct going to the outside. The polypropylene material resists moisture to remain corrosion-free.
- Retail cut case
- Increase bathroom fan exhaust venting diameter from 3-inch to 4-inch
- Not to be used in clothes dryer installations
- Made of polymer resin material
- Installation clamps or tie straps (not included)
(1) 3 inch to 4 inch Plastic Duct Increaser