DEWALT 20 in. 3-Speed Heavy-Duty Drum Fan with 6 ft. Power Cord DXF-2042 - The Home Depot
HealSmart 24 Inch Industrial Wall Mount Fan, 3 Speed Commercial Ventilation Metal Fan for Warehouse, Greenhouse, Workshop, Patio, Factory and Basement - High Velocity, 2 Pack - Walmart.com
Patterson Fan Co. - Industrial Fan Manufacturer - Industrial Air Cooling Solutions
Industrial Grade Wall Mount Fans - Air King Quiet Wall Mount Fans