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do you think that 2x 4" computer fans will do the job in getting air in and out enough to keep it cool
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It is possible. It depends on your set-up and location. If your grow draws air from inside your 70 degree home and you grow with low watt bulbs, it can be done.
I re-did my vents and blower set-up six times. I always underestimate how hot it gets in the summer here. I can't draw air from inside my home. If I don't cool my 400w bulb the room will get over a 120 degrees on a cool day.
My advice is "
over-kill the hell out of your ventilation system". You can always add a dimmer switch
Peace, R.