The WindMaster Revolution from Horton is a high-efficiency, hybrid-flow fan that meets the airflow demand of EPA10, Euro VI, and Tier 4 engines. The fan combines features from axial-, mixed-, and radial-flow fan technology to move air around the engine and through the underhood compartment. WindMaster offers energy savings and improved efficiency with reduced operating noise. Currently tested in various models, the fan is suitable for on- and off-highway applications. WindMaster Revolution fans are designed for compact engine compartments and are available in 550- and 750-mm (22- and 30-in) sizes. The former are engineered for off-highway equipment and medium-duty trucks, while the latter are suitable for heavy-duty trucks and some off-highway equipment and vehicles. Fans offer 20% greater airflow than axial-flow fans with a similar-size inlet and feature a 40% smaller depth and larger inlet diameter, requiring a smaller space than radial-flow fans.