I would get the active intake just for back up. Those Daytons arn't too strong IMO. May work, may not, but it would be a pain to get it all together then find out that you should of aded the active intake. If you don't need to use the active then you just turn it off, and the hole that it is running threw can still be used as a passive intake. This is the way I did my cab. Some days when it gets too hot I use the active, and on cooller days I just turn it off.
Adieu
BlueBear Reviewed by BlueBear on . 400w hps Hi all, New grower here and I a question about my setup. It's box I built thats 3' tall by 2' deep and 3 feet long. That's a totally of 6 square feet and 18 cubic feet. I recently purchased a 400w hps that is air-cooled with ducting. It has an attached ballast and I'm running a 465hp squirrel fan thru the ducting to cool the hps bulb. Now my first question is, will this fan keep my grow box cool enough? If not would some passive intakes (ie2-3 light-blocked holes on the bottom) and Rating: 5