Quote Originally Posted by SunLake
I currently have a 5x5 grow room with grow log that can be found at:

http://boards.cannabis.com/grow-log/...lo36-grow.html

I have several questions but the first is... is my Charcoal Filter in the right place?

I have 1 fan that has to run the exhaust.

I am using some ductwork to vent my floor vent for the central air of my house into the tent for fresh air.

I am using a 440 CFM 6" fan through a goblin charcoal filter for exhaust, with the charcoal filter place in the tent inline before the fan. I have heard that this greatly restricts airflow but seeing as though by tent is only 5x5x7 (175 CFM) I would assume 440 CFM x 3-5minutes would be plenty even if restricted by as much as 50%. Is there a better method?
More information on the fan would be helpful. A 6" Vortex fan is an entirely different beast than a 6" duct booster. If you are using a centrifugal style, you're all set. It'll move more than enough air. If you have a duct booster type, airflow *could* be marginal when drawing through a charcoal filter. I'd run the set-up for a couple days to get an idea of internal temps using your lighting configuration.

I hang the fan/filter from the top of the tent, as high as possible.

Quote Originally Posted by SunLake
Lastly, I have heard that Charcoal filters are activated by heat, since I am using LED for my main light source and Florsecent for 4-6 Hours a day I should be generating any significant amounts of heat, will the air still be hot enough to activate the carbon or should I consider another means of odor control?
I've never heard that before. I have seen folks bake carbon filters to remove excess moisture, but they work just fine at normal temps.

HTH