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.
- Moveable aluminum vanes, lintel not required
- For block, brick or frame construction
- 73 sq. in. net free vent area
- Louvers adjust manually
- Screen included
















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