QMark CWH3404F Commercial Electric Wall Mounted Heater A 20 gauge steel front cover provides damage resistance with an attractive appearance. An integral thermostat with a fan-only position is standard. It can be rendered tamper-resistant if required by the application . Standard controls include a disconnect switch, over-temperature protector and a fan control that prevents circulation of cold air. The totally enclosed, permanently lubricated fan motor provides a maintenance free long life. The unit can be recessed in a standard 2' x 4" wall.