Dayton hazardous-location upblast centrifugal ventilators are roof-mounted for continuously discharging hazardous chemical fumes & particles, dirty air, grease, foul air and odour from industries and commercial buildings. They have spun aluminium housing with backward inclined, spark-resistant aluminium wheels for corrosion resistance, durability and overload prevention, regardless of static pressure applied to the system. They feature belt-drive motors for greater flexibility in terms of rpm speeds, as the motor is not directly in contact with the fan's moving parts. Choose from a wide range of these ventilators, available in wheel diameters ranging from 11.25 to 18.50 inches.