The WindMaster Revolution is Horton's efficient hybrid-flow fan that meets the airflow demands of EPA10, Euro VI, and Tier 4 engines and combines the positive features of axial-, mixed-, and radial-flow fan technology. The fan is optimized to move air around the engine and through the under-hood compartment with low operating noise to provide energy savings and improve efficiency. Suitable for on- and off-highway applications, WindMaster Revolution fans are designed for compact engine compartments and are available in two sizes: 550-mm (21.7-in) fans are engineered for off-highway equipment and vehicles and medium-duty trucks, and 750-mm (29.5-in) fans are designed for heavy-duty trucks and equipment. WindMaster Revolution fans also feature smaller depth and increased inlet diameter, reducing space requirements. A larger hub section provides more fan-drive mounting options.