The GAF Master Flow Replacement Manual Foundation Vent allows air to circulate, helping reduce moisture and decay in the crawlspace, with a NFA of 67 sq. in. No mortar is needed, only 4 screws to install. It opens and closes easily with the push-pull damper and is made of durable ABS Resin. Has heavy-duty screen and fits the standard 8 in. x 16 in. opening. Color: Black.
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