exhast advice needed

My grow box is 14" x 33" x 65". I'm running cfl's. I plan to upgrade to hps. What size exhaust would I want for a 400 watter ?

what kind of reflector are you gonna run? that small of a grow area i would think a 9 dollar bathroom vent fan would be enough

that 400 might be to much are u planning on making a bigger room soon if not, go with a 250

archangel said:

My grow box is 14" x 33" x 65". I'm running cfl's. I plan to upgrade to hps. What size exhaust would I want for a 400 watter ?

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ya that seems just to small for HID lighting

i'd go with a 150HPS or make room bigger

well............ its 18 x 34 x 60............ i wasnt too far off for guessing. the reason why i said a 400 was i know where i can buy a used one that works for $25. I ordered a 120mm compfan. that moves 62 cfm. thats my 5 times air exchange rate. if needed ill add more fans.....https://www.rollitup.org/cfl-growing/390244-ok-take-blindfold-off.html....if not ill have to wait on the hid. thanks

My tent is just a few inches larger....I use a 400w hps cooltube with a 150w hps (open)....I use a 200cfm var. vortex which runs at about 1/2 speed but I also have another vortex supplying fresh air and blowing onto the smaller hps. No heat probs at all....but if the light you're gonna buy is open.......be sure to supply some ventilation for cooling....