The Dyna-Glo Silent Flame LPFA60Q Portable Indoor/Outdoor Fan-Forced Heater Heater generates instant heat for construction sites industrial work spaces agricultural buildings outdoor sporting events and other ventilated spaces. Rated at 36 000-60 000-BTUs with a 300-CFM blower the LPFA60Q heats a maximum of 1 350-square feet for a period of 7 to 70-hours depending on the BTU level selected and the size of the propane tank. The LPFA60Q requires electricity to power the motor and fan and it is fueled by a 20 40 or 100-pound liquid propane (LP) tank (not included).