Smokenpassout
Well-Known Member
I have the cheapest 4" carbon filter fan combo on HTG. Time to repace the carbon cannister. I was thinking of switching to a Phresh replacement 4" cannister. But the CFM is different. It is 200 CFM and my fan is rated at 170 CFM. Is that going to be close enough, or will it cause problems scrubbing my 2X2.5 tent efficiently?