for a 430hps your probably need a good amount more than a 4inch exhaust. hps puts out alot of heat. in my 2'x2'x3' box with 150hps i have a 180cfm exhaust and 4inch inline fan for intake. now that might be a little overkill but my temps are always the same inside the box as in the house because the air doesn't have time to heat up. pc fans work for small boxes with cfls or maybe a 70hps but you will need alot more than a pc fan for a 430hps
justaseed Reviewed by justaseed on . New Grow in a Box! Peace to all. I wish the Dead would tour again-anyway I am transplanted to the great North West and I am looking to see if the following will be the best set up? This is also my first indoor crop. Grow Box 4x4x6-Air Cooled 430 with a SonAgro bulb,lined with mylar. 4" fresh air at the bottom of box(intake) and exhaust out the top. I am thinking of using just a 4" duct fan for the light and a circular house fan for inside the box. Will I need more suction to bring in fresh air? Do I Rating: 5