Variable Fan Speed Controller 120V 5A 550W Variable fan speed controller 120 volts and pipes of 4" (100

and pipes of 4" (100 mm) diameter

VABINK 6 inch stainless steel clamps can tightly secure flexible aluminum foil ducts

4 inch (100 mm) in diameter and 25 feet in length

grow room and vent exhaust etc

Variable Fan Speed Controller 120V 5A 550W Variable fan speed controller 120 volts and pipes of 4" (100Specifications: 120V AC, 60Hz. Maximum 5 Amps. Maximum 550 Watts. Built in internal electronic auto resetting circuit breaker. Plug and play variable speed controller. 3 speed settings: HIGH, MED, LOW, with power On Off switch. Optimal control range: 50 100%. Standard 3 pole plug construction with compact design. Dimensions: 3. 6" x 2. 1" x 2. 0".