Transom is the result of a complete re-imagining of what a window fan should be. The air chamber abundantly draws fresh air from the outside in — or reverses electronically to exhaust stale air out. Powerful airflow circulation and comfort at half the height of conventional window fans, Transom is easy to install, blends elegantly into the space and preserves your view. Transom seals off windows 26” to 40” wide with the patented Soft-fit System that provides a sleek, satisfying and snug fit from end to end, without having to remove your screen. Transom – a new kind of window fan. From the Manufacturer From the Manufacturer: IMPORTANT INTERNATIONAL DISCLAIMER: This item is built to meet U.S. voltage requirements and may not function properly when used in conjunction with external devices that alter or convert voltage or frequency of electricity. Improper use or shipping the product outside the U.S. will void all warranties.