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Use a supply fan or intake fan to pull outside air into industrial and office buildings. Properly working supply fans are key components in HVAC systems, which clean, recirculate and control the temperature of warehouses, plants and offices. Grainger's intake fans are designed for medium- or heavy-duty applications and can be mounted vertically or horizontally in a wall or roof vent. Shop here to find the right intake fan or supply fan to optimize your HVAC system.