The GAF Master Flow 500 grate style foundation vent allows air circulation to reduce moisture and helps prevent decay in your foundation with a net free vent area of 28 sq. in. The vent is die-cast aluminum and features positive open/close damper action and lintel for foundation block construction. The damper adjusts manually.
- Positive open/close damper action, adjusted manually
- Lintel for foundation block construction
- 28 sq. in. net free vent area
- Screen included
- UV resistant
- Common: 16 in. x 8 in., actual: 17.5 in. x 9.25 in.
















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