I needed a window fan with a slim profile powerful enough to move enough fresh air in and exhaust well when cooking, showering etc. into the Victorian studio apartment I recently rented in San Francisco with little ventilation.  The TRANSOM is the first window fan that does the job and keeps this place fresh! Great design, mechanically very sound, quiet and effective! Good work Vornado!   P.S. Great price point for this quality.  RL, San Francisco CA