enough airflow?

Hey all, quick question.
my cabinet is 41"x30"x63" tall, Ive just ordered a 400w hps and plan on making the diy cooltube. Myfan is 6" 449cfm. my plan was to hook the fan upto the cool tube and after the fan, outside the cab to carbonscrubber. Do you think this will be enough ventilation, or do i also need an exhaust fan at the top of the cab? Also, what size passive intake hole would you suggest?

Thanks

to answer your first question... u have more then enough airflow..a basic airflow rule of thumb is.. you want the air exchanged twice a minute.. your working with about 45 cubic feet of space.. and a 495 cfm fan you will be replacing your air about 10 times a min..

secondly i would use the fan to pull air through the carbon scrubber rather then push it it will work more efficiently

yes the exhaust should be towards the top because heat rises..

and just make the passive intake hole the same size or a little bigger then the exhaust hole.. also dont forget to light proof.. can be done with a simple dryer exhaust vent...
best of luck man..

You can set the fan up like this - scrubber - fan (sucking through scrubber) blowing through cooltube, and you cant see the exit to the right, up and out. This keeps the light cool and takes care of smell with one fan. The intake is on the far right, so it pulls air through the whole room, promoting airflow. Theres also another fan circulating air in there.

Your 449 should be adequate. The intake should be 1.5- 2x the size of the exhaust IMHO, you don't want to restrict the ability of the fan to pull cool air in

Thanks guys, Yes, Ideally Iwant to use this fan for both circulation and odor. Thing is, a scrubber in the cab would be crampin on the grow space. If I set it up the way i mentioned above, would I be stinken up the basement?

Hang the scrubber from the ceiling and run it next to the lights, wont take up any room - It'll grab more heat and promote better airflow, butmay shorten the life of the carbon/kitty litter though. Nothing smelly exhausts from my room, just warm de-stinkified air.

As said earlier, most good fans tend to work a little more efficiently when sucking through a restriction, rather than blowing through one - which is why most of the time the scrubber is on the suction side. You CAN blow through them as well (I have), but may be compromising the cooling of your light and the airflow in the room. If blowing through a filter I'd say go one fan size up