The 50,000 BTU Natural Gas Unit heater provides safe, quiet, and reliable heat to turn your garage or barn into a work space you can use all year-round. 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 115V AC power and can be vented vertically or horizontally (Please check your 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.