Broan 4 in. W x 8.25 in. L Silver Wall Cap Vent Aluminum

The Broan NuTone 642 Aluminum Wall Cap is an easy to install vent for exhaust fans (bathroom, rec room, home gym, etc. This cap provides reliable ventilation and features both a back draft damper and bird screen, preventing outside air from entering the home and birds or small pests from entering duct work. Compatible with 3" and 4" ducting. Includes 4" 3" reducer. Not suitable for dryer venting.

For Aluminum duct Use with 3" or 4" duct