Fans boost air flow in hard to heat or cool rooms. Install easily in both metal and flex round duct. 6in. fan with 120 Volt, 30 Watt motor moves 150 CFM through 25ft. of straight duct. U.S.A. Auto and Manual: Yes, CFM: 150, Works With: Heating ducts, Motor: 30 Watt motor, Material Type: Metal with plastic blade, Mount Type: Hardwire of wire to an on and off switch (special order), Dimensions L x…