SIZE: 4" W x 3.75" D x 8.25" H SPIN: The blades spin faster as the fire gets hotter HEAT POWERED: No batteries or electricity required works with heat powered CIRCULATION: Ideal for all room sizes, the air max circulates more warm air further into your home ENERGIZED: This fan is powered by the heat produced by your fireplace or wood burning stove The Stove Fan is the perfect way to help heat your house on cold winter nights. This fan is powered by the heat produced by your fireplace or wood burning stove; the blades spin faster as the fire gets hotter, dispersing the heat throughout the room, no electricity needed! The blades will slow as the fire goes down, giving you a built-in indicator of when to stoke and add more wood. WARNING: This product can expose you to chemicals including di(2-ethylhexyl) phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.