Duct Heater Rentals, 85,000 BTU. Provides quiet operation with fuel-efficient direct-fired design. Delivers safe, dependable heating and air circulation. Great for tents. The area heated needs to be enclosed. (tents must have sidewalls). For up to 1000 sq. ft. Please consult with your A-1 Tent Rental rep for proper sizing. Please be aware that square footage is only an approximate depending on wind, extreme cold, etc. Price includes a 100 pound propane tank. Tank will last approximately 8 hours+ depending on conditions and settings. We will require an electrical connection which does not exceed 100'. The extension cord must be plugged into a working 3 prong ground outlet. The electricity is needed to run the fan for the heater. 120 volts 5 amps 85,000 BTU.