Pack pressure problems can be reduced by having the exhaust fan at the very end of the air path. In other words put the carbon filter in between the grow box and the fan. In other words have your fan sucking or pulling the air, not blowing or pushing the air.
To answer your question, it is hard to say how much backpressure will be reduced because we don't know the type or rating of the fan you have in mind. Inline fans handle back pressure better than others.
THickness of the carbon layer is not an exact science either. In the application used here there really isn't a great deal of particles causing the odor, so a large amount of carbon isn't really needed. I made a 20" x 20" x 1" carbon filter and it seems to do the job. That should give you a starting point.
iwishicould, that depends on a lot of factors. The amount of air moving through the carbon filter, the amount of humidity, the type of carbon (all carbon is not the same), the amount of carbon, etc.
Also Afterburner gives good advice about the ozone generator. It is overkill and, as he knows from experience, not healthy. |