Posted: Thu Dec 09, 2010 11:40 am
I've always owned a home. Now I've been forced to down size. I have a Miller CMF80 nat. gas furnace. I've fixed most all duct work leaks but... At the base of the unit is an area aprox. 6" X 12" that lets in a very solid and steady flow of direct outside air. Now please forgive my ignorance, but, this opening should not be here, is this a true statement? This unit I believe brings in makeup air through the door & filter not from outside. should I patch this opening. I feel there was another unit there years ago and this was never properly attended to. please give me your opinion.