The Arcotherm EC Series is a group of portable indirect-fired heaters available in three different sizes which offer a nominal range of heating power from 100,000 to 300,000 BTU’s. Indirect-fired heaters produce heat by creating a flame in an enclosed combustion chamber. The exhaust created in the combustion process then makes its way through a four-pass heat exchanger and finally expelled through a chimney located at the top of the heater. A custom exhaust vent can be attached to fit any application in order to safely expel the exhaust fumes when used in indoor applications. A powerful fan located at the back of the heater forces ambient room or atmospheric air through the unit, over and around the hot combustion chamber, and expels the freshly heated air out of the front of the unit. This expelled hot air can either blow freely or be ducted in one, two, or three directions to specific areas. The EC Series heaters are used indoors and outdoors in many different industries including, but not limited to, agriculture, aviation, construction, mining, and rental.