i've now read the most of the grow room setup thread, thanks :thumbsup:

ok a couple more observations...

when i computed the cubic feet and air movement, i used a 90 cfm computer fan as my base. i have done a little research today and have found that i can get a computer fan with cfm ratings that are much lower. so let's just use 25 cfm as my base. so now let me do some re-calculations.

setup:
-3'x5'x8' sealed room with one active exhaust (computer fan, 25 cfm sucking the air from the room through a carbon scrubber)
-passive intake (except when heat/air are running. i need to find out what the output cfm is for my HVAC)
-120 cubic feet in the room (roughy 15,000 cubic feet in my house)
-LED's and CFL's for lighting so heat will be very minimal.

assuming the HVAC output in cfm doesn't over do the computer fan i can maintain negative pressure in the room.

so with the lower cfm fan i can reduce how much air i am actually pulling out of my home and exhausting into the attic. if my re-calculations are correct it would take 10 hours to suck all the air from house. of course where i live the A/C is running frequently, so i think the loss of cool/heated air would be minimal...

a question for some of you who might know; what kind of output in cfm does a 3.5 ton HVAC unit put out? What i don't want to do is create positive pressure in the room... on a side note, i could create a passive output as well with another carbon scrubber for when the A/C is running. That way i could prevent any positive pressure issues....

as far as returning the scrubbed air to the room, i think that would cause positive pressure issues also, so i am scraping that idea.


anyone else have comments/questions/advice?

thanks :jointsmile:
GP73LPC Reviewed by GP73LPC on . Grow Room Questions About Heating/Cooling/Odor Control I am planning on enclosing a little cavity corner in my garage that will create a 3' x 5' room. It will be rather easy to connect it to my central heat/air but i worry about odor control. i have successfully used some very small ozone generators inside cabinets in the past. those along with exhausting through activated carbon worked very well. only one strain was ever detectable by smell. with that said i will definitely be using 1 or 2 of these small ozone generators. the room will Rating: 5