The motors are water-resistant and are safe to use during rainy weather. Designed to fit most double hung and slider windows. 1 adjustable accordion extender screen and 1 5-inch removable panel help secure fan in larger windows. The product comes with a 3-year limited warranty. Amazon.com. In with the good air, out with the bad air.
https://www.amazon.com/Holmes-HAWF-2041-Comfort-Control-Thermostat/dp/B00005CDPH