3 in. to 4 in. Roof Vent Kit for Round Duct Steel in Black Value:each Manual Override: Push button lets
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Description
3 in. to 4 in. Roof Vent Kit for Round Duct Steel in Black Value:each Manual Override: Push button lets Manual Override: Push button lets you turn the fan on for immediate ventilation needs Reliable Crimps: Factory calibrated and meets ASTM F 1807 for consistent