Salamander Designs SA/XR40/AC Active Cooling Extended Rear Panel Constructed of heavy-weight black powder-coated steel with ventilation louvers. Adds additional 3.5" to the inside depth of cabinets. Thermostatically controlled cooling system turns on at approx 80 degrees F, maximum speed is reached at 95 degrees F. Quiet (22 dBA) dual- 120 mm fan Cannot be used in conjunction with Chameleon TV mounts