SPAL AP90 High Output (HO) Series electric cooling fans improve airflow in high static pressure situations across the spectrum of diesel engine applications including on- and off-highway heavy-duty vehicles, trucks, and buses. Features include a curved blade design, and fans are available in 11, 12, and 16 in sizes and in 1604, 1870, and 1953 cfm, respectively. HO Series fans can move air efficiently because SPAL controls every aspect of production, engineering and manufacturing all parts so the motor, blades, and shroud are designed to function as complementary components of the fully assembled unit. The AP90 models feature rigid, glass-filled nylon blades to minimize vibration. Fan motors are sealed and balanced, and the assembly is high heat resistant.