I bought this fan last June and used it for a couple months. It's in excellent condition, but I'll be moving so I don't need it anymore.

https://www.amazon.com/gp/product/B00008XET9/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Two speed-settings and manual-reverse air flow control
Ideal for large rooms. For slider windows will fit windows 10 inches wide and 36 inches high
Made in China
Twin 6 inch blades
Designed to fit most double hung and slider windows
Slim design allows for use with screen in place
Two speed settings
Water-resistant motors