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Re: ventilation
It depends. You should have a fan on your plants anyway. I have one that blows between the lights and the plants to get the lights down lower. If you're in a situation where you can leave the door open while the lights are on then you won't really need more than a small fan. But if you're in a situation where it has to be closed up then you'll need to ventilate and exhaust it someway.
~Worm
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