Broan 4" Round Aluminum Wall Cap

The Broan® 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.