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nope u aint missing anything, the walls wont reflect as much of the light as they wud if they was a ft closer but its no gr8 loss. a good size 4 a 400w hps is 4ft by 4ft, thats just wot u have + a extra 1ft to put ur fans and other stuff in. if the vent was at the top insted of at the bottom id say that room was made 4 a 400w growlamp.
when venting u wanna get the hot air from the top of the room out and cool air in at the bottom. a lengh of ducting and a fan near the top wud sort that, if u cud leave the door open and have a fan in the doorway blowing cool air on the plants that wud b ideal.
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