Check the listing for details. KF5120 Fan Speed Controller – Adustable from 30% to 100% Output. Condition: New. Listed at 39.99 USD. The Fan Speed Control with Piggyback Plug is great for direct control of 120V fans/ventilators. The fan control lets you adjust fan speed for exhaust and circulation fans from 30% to 100% of output capacity – shaded pole , P.S.C. , and universal. It also provides the ability of turning a fan on and off. The controller comes in a weatherproof and corrosion proof polycarbonate thermoplastic enclosure.The fan control is commonly used in the winter when less ventilation is required and too much cold air flow can harm greenhouses.Original equipment manufacturers & agricultural communities worldwide use temperature controls designed & manufactured by K-Kontrols. Our temperature controls are great for barns, greenhouses, livestock buildings, & more.