Lasko 2138 8-Inch Electrically Reversible Twin Window Fan, EA, Off-White Plastic Made in US Two, whisper quiet speeds E-Z-Click expander panels for a safe, custom fit Fits windows 25" to 35"W and 12"H and larger Snap-on feet included for table or floor use 8-inch electrically reversible twin window fan with 2 quiet speeds Independent motor control for air intake, exhaust, or exchange Fits windows 25 to 35 inches wide and at least 12 inches high E-Z-Click expander panels; adjustable thermostat; snap-on feet included ETL listed. Patented fused safety plug. 8-inch electrically reversible twin window fan with 2 quiet speeds Independent motor control for air intake, exhaust, or exchange Fits windows 25 to 35 inches wide and at least 12 inches high E-Z-Click expander panels; adjustable thermostat; snap-on feet included ETL listed. Patented fused safety plug.