This high-efficiency 40,000 BTU propane forced air heater delivers reliable temporary heating for construction sites and other applications requiring portable heat. With 99.9% fuel efficiency, it maximizes heat output while minimizing fuel consumption, providing up to 14 hours of operation on a standard 20 lb propane tank. The versatile design allows for both direct heat application and ducted operation, making it ideal for spot heating or warming larger enclosed areas. CSA certified for both indoor and outdoor use, this heater combines powerful performance with safety features including tip-over protection and thermoelectric safety valve.