Quantem Fan Speed Controllers modulate fan speed according to temperature change. The fan slows to idle speed when the temperature drops below the adjustable set point and increases to maximum speed as the temperature rises from the set point to 6° F above the set point.This controller has a NEMA4 moisture-proof enclosure with a 3-second kickstart. The controller has a universal line power 96/264 VAC. Features/Specifications Temperature Range: 35° F – 95° F Voltage: 96/264 VAC Output: 8.5 full load, 20.5 locked rotor Setpoint: Local set pot, 5 deg F divisions Control: Phase control proportional, 6 deg F bandwidth Operating ambient: up to 200 feet Maximum Speed: 98% line voltage Temperature Range: 35° F – 95° F NoiseRF suppression standard 8.5 Amps Works with 110/220 Volt (This Product is wired with 120v Plug) 4x4 Junction Box Dimensions: 4.3" W x 5.9" H x 4.9" D