"This Flagro Dual Fuel Construction Heater runs on either propane or natural gas to provide up to a whopping 1,500,000 BTU of powerful heat. Simply turn the fuel selector valve to switch the fuel supply. Product Style Industrial heater, Includes Electronic direct spark ignition, Dimensions L x W x H in. 48 x 22 x 24, CFM 2,000, Volts 115V, Color Black, Thermostat Included Yes, Blower Included Yes, BTU Output 400,000. 100 flame safeguard system Designed to withstand commercial applications Easy to operate Minimal servicing required Environmentally friendly with minimal combustion impurities"