Ecofan heat powered fan, effective on freestanding wood stoves. Increase comfort by moving warm air throughout your living space rather than just letting it rise to the ceiling above the stove. Saves energy costs by improving heating effectiveness. Starts automatically and adjusts its speed with the stove temperature. Unique blade designed to deliver a broad cross section of gentle air movement to avoid uncomfortable drafts. No cords, plugs, or batteries are required. Whisper quiet and completely assembled. Two year warranty.