Bath Fan Vents

You can maintain a consistent look, with the Dryer Wall Vent's low profile aesthetics, for bath vent fan exhaust terminations. The only requirement is that the fan pushes air at 70 Cubic Feet per Minute (CFM) or higher (most quality fans exceed that). When deciding on a bath fan, it is good practice to select a higher CFM. The idea is that the faster air is replaced in your bathroom, the more quickly humidity is removed.

Why a minimum CFM? The balanced, low-power magnets that help prevent pest intrusion require a little boost to get the damper open.

Lab testing confirmed that the DryerWallVent Performs well for a typical bath fan as shown below.

Bath Vent and Dryer Vent Termination

NuTone 70 cfm Fan (Model 769RL, "B" Unit)

Duct Run Equivalent Length Duct Run Specs Termination WCI Airflow at Termination (in ft./sec.)
N/A readings at fan output (no duct) N/A N/A 20.34
25 ft. straight run none 0.15 17.06
25 ft. straight run DWV4 0.20 15.75
30 ft. 25 ft. of duct, with 90 degree elbow at 8 ft. DWV4 0.24 15.75
35 ft. 25 ft. of duct, with 90 degree elbow at 8 ft., and a 90 degree elbow at 13 ft. DWV4 0.27 15.42