Can an exhaust fan stick out of the outside wall?A. The Broan QTR080 exhaust fan cannot stick out of the ouside wall.
Is there a reducer from a 4" opening to 3" duct work?A. There is a reducer that can reduce 4" ducting to 3" ducting. That product is the Air King AK34R. Please be aware thought hat reducing the size of recommended ducting can effect the performance of your ducting project.