Genesis Twin Window Fan with 9 inch Blades High Velocity Reversible Airflow Fan

The fan can be used as an intake fan or an exhaust fan. there are 2 expandable side panels allowing the perfect fit to any window frame up to 37 inches wide. Each side panel can extend up to 6.5 inches. There are also 2 removable legs to use the fan while standing on its own. There is a built-in thermostat with led indicator lights to keep the fan at a comfortable setting. Each of the two 9 fan heads has its own independent durable copper motor. the dimensions are 24 x 12 x 4 inches. This is an energy saving device and is etl approved for the utmost safety.