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Best 639 Black


Best Wall cap 639 Black 10 in. in Black



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The 639 Steel Wall Cap is a robust, easy-to-install vent for exhaust fans (bathroom, range hood, 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. The back draft damper is spring loaded and features a padded damper zone, which reduce noise from wind induced chatter. Compatible with 3-1/4" x 10" ducting. Not suitable for dryer venting.

Spring loaded backdraft damper with padded damper zone reduces chatter in windy conditions
Built-in bird screen prevents birds and other small animals from entering duct work
Durable steel with a black powder coat finish
Easy to install in new construction, replacement, or DIY applications
Integrated 5" steel duct connector
Compatible with 3-1/4" x 10" ducting
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While we do our best to ensure the accuracy of our data, errors can sometimes occur. We recommend reviewing the manufacturer's spec sheet to confirm colors and dimensions.