Master Flow Block Style 16 in. x 8 in. Aluminum Foundation Vent

The GAF Master Flow BVSII block style foundation vent with moveable louvers allows air circulation to reduce moisture and helps prevent decay in your foundation with a net free vent area of 73 sq. in. The block design allows for easy installation and is constructed of galvanized steel and aluminum louvers. The louvers adjust manually.

• Foundation vent for block, brick, or frame construction
• Aluminum construction; lintel not required
• 73 sq. in. net free area per vent for high level ventilation