Horton's Arctis two-speed fan drives offer engine cooling for medium-duty trucks, buses, severe-service vehicles, rear-engine cement mixers, and other on- and off-highway equipment with little to no ram air. The Arctis line provides 225 lb•ft (305 N•m) and two-speed technology powered by eddy current, turning the fan at a lower speed. When the vehicle needs more cooling, the fan drive springs actuate to run at full input speed. Eddy current mode provides sufficient cooling in most operating conditions, reducing full-speed fan operation to improve fuel economy, decrease operating noise, and increase available power for auxiliary systems. Fewer fan engagement cycles also improve fan drive, belt, and tensioner reliability while minimizing radiator abrasion from dust and debris. Easy to install and maintain, Arctis drives feature improved bearing technology, a high-torque clutch pack to drive larger fans at higher ratios, and a larger air chamber for full disengagement.