The Eco-Aire from United States Stove Company is one of the most innovative heating appliances to come to market since the advent of the Multi Fuel stove. It combines all the convenience of a pellet stove in a portable cabinet designed for installation in a window or wall. This unique design allows it to provide a significant amount of heat while using a minimal amount of space. Perfect for all season patio rooms, small apartments, attic expansions and hard to heat areas of the home.The 2400 can be installed as needed for the season then stored when not in use. The Eco-Aire is self-contained meaning everything it needs to function is contained in the cabinet. **NO EXTERNAL VENTING NEEDED** In addition, because the Eco-Aire draws the combustion air from outside and then expels the exhaust back outside, it will not affect indoor air quality and is safe to use in garages and shops..