I need to work on my exhaust system, i read initially that you only need to replace the total cubic feet in 3-5 minutes. My box is measured at 40 cubic feet, the fan i bought is a bathroom fan mounted at the top of the box and rated at 70CFM. After reading posts i found out that it should be 3-4x more than your total cubic feet for proper ventilation. I am thinking of getting better bathroom fans rated at 120CFM with a rating of 1.0 sones (keeping it quiet as possible).


comments/tips welcome

thx guys