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 a 100 cfm 4" computer fan on the opposite top actively pulling air out covered by a homemade carbon scrubber be enough to do the trick?

If not, what do you experts out there suggest to keep the box cool enough?

Finally, how many full size plants can I scrog under this light? I was thinking 2-3, but I don't want it overcrowded in there.

Thanks for all the help

PS I'll try and post pics of it when its finished and thru the grow
manowar Reviewed by manowar 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