Product review (5 stars): Works as it should -put in garage window.
My dryer exhaust emptied into the garage (just moved into the house) and needed a solution and didn't want to put a hole in the wall. This easily fit into the window and connected it to the exhaust.  There is a flap the blows open when the dyer is on and closes when the dryer is off. This keeps the bugs out when the dryer is off.  My exhaust runs about 20 feet and the flap still blows open.  I spray painted it white so it doesn't stand out too much in the window. Perfect solution to an annoying problem.