ventilation

I just bought a 600 watt with a 6 inch cool tube. The closet dimensions are 4x10x8. Most likely,I will be adding an additional 600 watt like to this space. Not all space is used for growing at the moment.
The question I have is that I am now shopping for a fan to handle cooling of two lights, run a carbon filter to handle odor, and exhaust my space sufficiently. Should I stick with a 6 inch fan rated at about 400 cfm, or should I upgrade my ducting to accommodate a 8 inch 740 cfm fan?

After checking wit ma multiplication tables it seems U gotz 320 cubic footsies...4x8x10. U want to be able to vent the entire space within 3-5 minutes... a 400 will suffice but i like getting more than what is required and using a speed controller to dial it back. Its up to you..you can try the 400 first and take it from there.

Use the link below and work it out for yourself.


http://urbangardenmagazine.com/2010/07/planning-your-grow


I always vent at least once per minute. Anything over 3x per minute and you need AC.



J