One-piece polyethylene venturi housing for easy maintenance and superior performance. Heavy-duty blade and motor mount is attached to multi-adjustment bracket for tilt and lock fan angle adjustments. Safety wire guards enclose ½ HP direct drive motor. Powder coat finished bracket, motor mount and wire guards. Motor features enclosed ball bearing with automatic thermal overload protection. Ready for hard wire installation. 24 Model offers variable speed operation when used with a variable speed control (not included) and 3 aluminum blades. 36 Models have 1-speed with 3 galvanized steel blades. Meets OSHA standards. Motor is UL/ULC recognized. 2 Year Limited Warranty.