The light in my cabinet has it's own ventilation system with a 6" duct fan that draws air over the light. The intake/output are the two 4" vents you see on the upper portion of the back of the box. I use a CAP AIR-3DN to control the environment for the grow chamber, which has active intake and exhaust fans. With my garage in the low 30's I can keep the box in the mid 70's. If the ambient temp starts to climb so do the inside temps. I'm in the process of having a whole house back-up generator installed. Once the electrician completes the work, I'm going to put 2 dryer vents in the back of my garage and and hook-up the intake and exhaust to them with the idea that the cooler outside air will help. Bottom line, you'll spend a bunch of $$ on cooling to keep an enclosed space at the right temp for your plants. My other concern is night temperature when I go to flower later in the month. I've ordered a 120v 24" baseboard heater that I'm going to mount in the box. The CAP AIR will control this also. Originally I had a small portable electric with a fan, but I'm out of room with 9 - 12" pots in the cab. I'm sure the population will shrink once I weed out any males, but I didn't want to cook the roots while waiting for flowering..

Hope this helps you!

Farmer Rich
Farmer Rich Reviewed by Farmer Rich on . Will this exhaust 1000 watt HPS? Well, this site seems to be overrun with underage smokers rather than of age growers, and there doesn't seem to be enough traffic in the grow forums, so I'm attempting at asking my questions seperatly. Will this exhaust a 1000watt HPS aircooled hood from a 4x4 hydrohut? Vortex 4 Fan Carbon Filter Combo - Vortex Power Fans Rating: 5