We raise & show rabbits so we bought this fan for our rabbit barn because the ammonia smell was getting really bad in there & we needed something to pull that smell out. The barn isn't real big so there's wasn't enough air flow in there with only 1 window & 1 door so... needless to say we are VERY pleased with this exhaust fan!!! We keep the fan on exhuast 24/7 & you would never know that rabbits lived in there! It gets the smell out seconds after turning it on. I love that you can put it in the window & still be able to close the window behind it during bad weather. I was surprised at how inexpensive this fan was too! Definitely worth buying! & If something were to happen to the one we have we will definitely be buying another one!