With a previous unit, the home fire alarms continuously came on because it did not exhaust any smoke. This model works very well. It exhausts all of the smoke and smells. For example, recently we fried fish and could smell the fish outside and only a little inside. It works and the alarms do not come on. The only reason I did not give it a five star rating is because the sliding clasps that hold the screen to the unit sometimes won't hold it in place. So you have to make sure that they are actually grasping the unit before releasing the screen when remounting it after cleaning. A simple, non-screw, clasp could be easily designed to fix this small problem.