| All units are Speed Controllable with Optional Controller | Guards comply with OSHA regulations | Aluminum propellers | Includes automatic shutters | Easy to install, efficient exhaust fans have automatic shutters | Heavy duty guards have gray polyester coating to resist corrosion | Totally enclosed, sleeve or ball bearing, 115V, 60 Hz motors | Shipped Completely assembled | Use speed controller #5ACC035C | Widely used for ventilating stores, offices, factories, shops and farm buildings.