3 in. to 4 in. Roof Vent Kit for Round Duct Steel in Black Value:each The LM400 has a vertical

The LM400 has a vertical storage position

) 16889 cu in Included Accessories Keyed Lock

It has a rubber over-molded comfort grip that delivers optimal balance and control even when used for long periods

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

3 in. to 4 in. Roof Vent Kit for Round Duct Steel in Black Value:each The LM400 has a verticalThe RVK1A Steel Roof Cap Kit is an easy to install vent for ventilation fans (bath, rec room, home gym, etc.). It is compatible with 3" or 4" ductwork and includes a 3" to 4" adapter for convenience. This cap features both a back draft damper and bird screen, preventing outside air from entering the home and birds and small pests from entering duct work. This kit includes all materials needed for installation, including 8 ft. of 4" flexible ducting,