If smoke filtering into the room instead of drafting completely up the chimney is a problem in your home, then you must invest in a SmokeGuard Eliminator. Usually when you are faced with the problem of smoke rolling out into the room, the problem is usually a fireplace opening that is too high to contain the smoke. This design is constructed to keep smoke from going into the room and directs those fumes so that they go up the chimney as they are supposed to. Heat resistant adhesive caulk is included to seal SmokeGuard in place and this design is created to fit chimneys with opening widths from 28 1/2 to 48 inches wide.