TPI Commercial Air Circulators efficiently move and cool air in factories, warehouses, institutions, etc. Run efficiently on ball-bearing, totally enclosed motors. Pull-chain switch activates steel hub and spider aluminum blades. Motor runs efficiently in temperatures up to 135°F. Chrome-plated steel fan guard. Three blades. 18'L cord with 3-conductor plug. Factory assembled fan head and mount. Meet federal OSHA standards and are UL listed. 1-year limited warranty.