fan setup questions

got a couple of questions about the ventilation i'm planning on getting
first off my room dimentions = 2 foot by 3 foot by 6 foot approx
my light is a 600w hps growlux external ballast. thats in a 6 inch cool tube

now to keep all this cool i have been looking at speed controllable 6 inch fans with a fan temp speed controller.

http://www.justfans.co.uk/plastic-tube-extractor-fan-150mm-4-speed-p-303.html

http://www.1-hydroponics.co.uk/web/manual/doc/hydro-garden/prima/fan-control/

would this be the right fan/controller? if it is then it would work very well for me as i can set fan to idle at nightime but keep the neg presure in cab

but today when looking i found this

http://www.hg-hydroponics.co.uk/ruck-rkw-fan--thermostat-125mm350-1749-p.asp

now this looks almost perfect for me but i am a bit worried about what will happen st nighttime will it keep running or will it turn off and lose me my negative pressure?

thats a pritty small spot for a 600 watt, i have two ina a 5'x 13' x8' room and the temps get really hot so i use air cool hoods and run my exhaust fan all the time.. helps with smell and air flow as well... unless this little area is out in a shed or some thin ur temps will never get to cold... get a fan that's around a 100 cubic feet a min... your room is only gonna be 36 cubic feet.

kahtn said:

thats a pritty small spot for a 600 watt, i have two ina a 5'x 13' x8' room and the temps get really hot so i use air cool hoods and run my exhaust fan all the time.. helps with smell and air flow as well... unless this little area is out in a shed or some thin ur temps will never get to cold... get a fan that's around a 100 cubic feet a min... your room is only gonna be 36 cubic feet.

Click to expand...

yeah i realise im cramming alot of light in there lol but thats why i was looking at a larger fan that i could turn down if needed. also want a slower speed at night as the grow's in my bedroom.

ahhhh i see.. then ya just go with the last one... there all good but the last one is what id use...

ginjawarrior said:

yeah i realise im cramming alot of light in there lol but thats why i was looking at a larger fan that i could turn down if needed. also want a slower speed at night as the grow's in my bedroom.

Click to expand...

A slower speed at night would be convenient for sound but if you are venting back into the room than it is going to get real hot real quick