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if you are pushing air out of the room then air has to be coming from somewhere; if you have a fan pulling air out and another fan just circulating you might not get as much ventilation as you'd hope. the air is seeping in from the cracks in the door (not good flow). your plants still look good...

Hey guys, I'm new to the forum and have been reading tutorials ect. and I'm thinking about growing. I'm planning on growing in a small (but not too small)"hidden room" on between my attic room and the roof of the building. I'm considering buying a 400W HPS bulb for 4 or so plants (is this a good...