Forced Air Turbine AT520 for Fireplace Heat Distribution System. Capable to force air of a temperature up to 200F through ducting system simultaneously to 8 ceiling vents / rooms. Equipped with air filter and by-pass system for safety of use. Turbine provides full comfort on cold days evenly supplying hot air to the area of up to 2500 sq ft. Efficiently and effectively utilizes heat produced by wood burning stove or a fireplace insert. Functional, Independent source of Heat – your peace of mind!