California Proposition 65: This product contains a chemical known to the State of California to cause cancer. This heater can be mounted vertically or horizontally on to a ceiling using threaded mounting rods and requires four 5/16-18 thread size rods sold separately to fit in to the threaded holes on the heater with at least 7.5 length and secured in place using lock nuts. This 650 CFM forced air unit heater with advanced pull-through air flow design draws air across heating element to quickly create hot air that is evenly distributed into a room to reach desired temperature levels. In addition, louvers adjust up and down for even greater control of throw direction. The unit can provide up to 25,600 BTU or 7,500 Watts of heat. Easy to use built-in turn dial thermostat goes from Min position all the way up to Max and can be set at desired comfort level to cycle on and off automatically. It is constructed from cold rolled steel for extra toughness and durability. The unit comes equipped with thermal cut-off protection, a safety feature that will automatically turn the heater off if overheating occurs. This 480 Volt heater is a three-phase operation. Easy to install and quick access to control box and wiring makes it easy to service.