This is 9 in. reversible twin window fan with built-in thermostat. It features wind-in, wind-out and wind-exchange option. Its turbo fan blades help speed up maximum air movement. The design for the accordion expanders make it fit most windows and its removable legs and molded handle make it more convenient to use. Features: 3 speeds option With wind intake, exhaust and exchange functions With built-in thermostat Removable legs and molded handle for portable use 2 accordion expanders to fit most windows Turbo fan blades designed for maximum air movement Strong plastic housing 100% copper motor No tools required for assembly Fan size: 23.8 in. x 5.3 in. x 12.6 in. Click here for more information on Electronic Recycling Programs