You will have all kinds of trouble with your grow if you dont address the venting. Ill ask again, what do you plan to do about the heat?

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in the flowering chamber i will use the other bath fan for intake....hook up a 500 cfm inline fan straight to a cool tube to vent light i'm hoping that 500 cfm's will be enough to vent light and flowering space if u or any one else think i need more cfm's i'm going to go get it right away i will also have a fan for air circulation also inside the chamber

which i have a question ok 4.5x4.5x7 would approximately be about 140 cubic feet (I think that's right)
the question is what would be the amount of cfm's needed to have good airflow
I seen the formula somewhere I just forgot it....
if anyone has this formula please let me know....

no formula... just get a fan that can circulate the air once every few mins. since you have a strong fan hooked up to that hps. your room shouldent get too hot. so a fan thats 150-200 cfm should do the job well

i was told by bghydro that if i use a 4x4 space for that hps light i need at least 400cfm's to keep the room temps down.....have u or anybody else seen a 1000w cooled with 200cfm's ...if so that will make it a whole lot easier on me purchasing a fan and with electricity

if anybody has any info on cfm's or cooling a 1000w light please feel free to jump in...

i was talking about the room... not the light. and i dont know anything about cooling a 1000 watt hps. i suggest checking out the live chat feature. a few good growers chill in there

thanks again man