Imperial 4 In. Dia. To 3 In. Dia. Aluminum Vent Decreaser

This Imperial 4-in to 3-in Aluminum Reducer allows you to connect pipe of different diameters where air flows from a larger pipe into a smaller pipe.

Crimped on the small end, it reduces the diameter of a 4-in round return or exhaust air pipe to 3-in, while maintaining optimal airflow.

The reducer is ideal for general purpose venting applications and is quick and easy to install.