Dayton downblast ventilators are roof-mounted for discharging dirty air from industries and commercial buildings. They are designed to operate continuously to vent foul air and odour under low to moderate static pressure conditions. They have spun aluminium construction with a fully rolled windband bead for corrosion resistance, durability, stability and portability. These ventilators feature direct driven motors that are directly connected to the fan through shafts or axles, thereby increasing energy efficiency. Selected models come with a speed control for controlling the speed of ventilators. Choose from a wide range of these ventilators, available in wheel diameters ranging from 8.25 to 18.5 inches.