My setup is somewhat different than yours so my methods may not apply. I use a Hydro Hut so essentially I have a grow room within a room and I am able to keep the cool tube sealed off completely from the grow area - air comes into the tube from outside the hut, through the tube and is expelled outside the hut though a window - that way the only odor I have to control is from within the grow area which is where my carbon scrubber is attached to the squirrel cage to exhaust, circulate, & scrub the grow room air. Intake is passive through vent flaps.

Your closet area has different requirements and the fact that you don't want to do any hole cutting has its on limitations. Is the closet completely sealed from the other areas? You may end up using your original idea and it might be perfect for your setup! Keep us up to date so we can all benefit from your experience.
doco Reviewed by doco on . CFM backpressure i was reading this on another thread fans are tested without ducting which give them the cfm. The thread also mention that if you use ducting, it will cut the cfm by half. No one on that thread asked if it will cut more than half if ducting and carbon filter is use. It got me thinking since i just upgraded and i need a fan that will cool 2000watt in a 64 cubic feet room. Any input on this would be great. thanks in advance Rating: 5