Holmes Twin Window Fan with Thermostat. Thermostat turns on/off to control and maintain desired comfort level. Unit works by Drawing in cool air and exhausts hot air out, or exchanges air with outside. It can fit double-hung, vertical slider, and casement windows of width 24 inces - 37 inches wide. Height is 12.5 inches, overall. 8.5 inch fans, with 215.90 mm Blade Span. Extenders that permit custom fit included. Plus, the unit comes with one touch electronic control for added convinience, and two-speed setting and temperature control.
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