Buy and sale window fan: Holmes HAWF-2041 Twin Window Fan

Holmes HAWF-2041 Twin Window Fan

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Draws in fresh, cool air from the outside or exhaust stale, hot from inside. Independent draw-in and exhaust-out settings allow fan to do both simultaneously. Thermostat turns fan on and off according to a preset temperature level, plus three speeds for each fan allows the unit to adjust nicely to conditions. Designed to fit double-hung, vertical and casement windows, the fan comes with a built-in 7'' extender and two separate 3'' extenders, letting you custom fit it in windows from 24'' to 37'' wide. Lightweight plastic. Move it easily from room to room. The fans have six blades and measure 8-1/2'' in diameter. Overall, the unit is 12-1/4'' high. Fully assembled.

Draws in cool air or exhausts hot air--or both at once
Three speeds for each fan; thermostat turns fan off/on for comfort level
Fits double-hung, vertical slider, and casement windows 24-to-37 inches wide
Extenders permit custom fit; 12-1/4 inches high overall, with 8-1/2-inch fans
3-year warranty against defects

This double window fan can draw in fresh, cool air from the outside or exhaust stale, hot air from inside. Or, because of the independent draw-in and exhaust-out settings, it can do both simultaneously. With a thermostat that turns the fan on and off according to a preset temperature level, plus three speeds for each fan, the unit adjusts nicely to conditions. Designed to fit double-hung, vertical, and casement windows, the fan comes with a built-in 7-inch extender and two separate 3-inch extenders, letting you custom fit it in windows from 24 to 37 inches wide. And because the unit is lightweight plastic, you can move it easily from room to room. The fans have six blades and measure 8-1/2 inches in diameter. Overall, the unit is 12-1/4 inches high, arrives fully assembled, and carries a three-year warranty against defects. --Fred Brack