Dayton filtered centrifugal ventilators supply untempered & filtered make-up air for applications in warehouses and commercial kitchens. They makeup air in indoor spaces when interior air can not be recirculated and need to be vented out. These ventilators have galvanised steel construction with 13-1/4 inch diameter steel wheels & neoprene isolators for strength & durability and reducing vibrations & noise. These ventilators feature a weather hood with easily cleanable aluminium filters for catching dust and other contaminants present in air. They feature belt-drive motors for flexibility in terms of rpm speeds, as the motor is not directly in contact with fan's moving parts. Choose from a wide range of these belt-driven supply ventilators, available in fan speeds ranging from 550 to 890 rpm.