Mr. Heater Big Maxx forced air natural gas unit heater is efficient and effective convection heat for your garage or workshop for residential or commercial use. If you are looking to turn your garage or barn into a work space you can use all year-round, you will have to find a safe quiet and reliable heat source. This 50,000 Btu natural gas unit heater is the way to go. It uses a built-in electric high velocity fan to pull cool air into the rear of the heater, across a heat exchanger, then forcing warm air into the surrounding areas. These heaters only require 115 VAC power and can be vented vertically or horizontally please check local codes and restrictions. With a mounting clearance of only 1 in, the supplied brackets, external access to power and thermostat connections, installation is a cinch. With the Durable Spark ignition and robust factory standard self-diagnostic control module, we can offer a 3 years factory warranty on all parts and burners and a 10 years warranty on any defects in the heat exchanger. This heater offers the operating versatility and safety that you have come to expect from Mr. Heater.