The GAF Master Flow LW1 grill style foundation vent allows air circulation to reduce moisture and helps prevent decay in your foundation with a net free vent area of 50 sq. in. The vent is installed by nailing to floor joists or use as a block replacement. The LW1 is die-cast aluminum with screen and a damper. The damper adjusts manually.
- Die-cast aluminum
- Can be used as block replacement
- 50 sq. in. net free vent area
- Damper adjusted manually
- Screen included



















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