The Portable Sun Seeker Solar Powered Fan is a quiet solar powered waterproof recirculating fan that distributes heated air into a room. It is designed to be used for exterior applications by being mounted to an exterior wall or used inside by setting it on a solar stand, which is included. Under good winter sun conditions, up to 25 degrees F (14 degrees C) may be added to the ambient temperature in the room with a maximum air flow from the solar fan of 40 CFM. It also features an adjustable speed control knob. External application requires that 3” duct hose (not included) be attached to 3” duct ports, penetrating the exterior wall and run into the room, allowing warmed air into the space.