ok so you have been given a lot of advice and i my self run 2 600's, in a 5x10 room.with a 7x7 room do not hook up a charcol filter at the end of your lights,this will slow down 2 things, the air exhausting the room and the heat evacuating the lights. use a seperate fan doesnt have to be huge or expensive to solely run the lights.find a wall cut a hole through it. 600 to ducting to your other 600 and out another hole out of the room.if you use only any exhaust fan it needs to be twice as big as it would be if you were yousing an intake fan, this is because you are using that fan to now do 2 jobs.your room absolutley must be 100%air tight in order for a passive system to work.the only air coming in will be through your pre cut intake holes...you could try the other suggestions,but i have tried them all and i live i a verry cool environment and am still having mild heat issues.. personally its just easier to use 2 or 3 fans. i use 4. to small intakes @145 cfm a piece one exhaust 445 cfm with a charcol filter and a 245 cfm for my lights.all 4 fans have differnet uses. soooo, in short if you do the passive u must vent the lights with the own dedicated fan of reap the heat issues, find an 8 inch of 12 inch fan for your filter and exhust. i hope you find the bet method with out having to spend a bunch of money,best of luck.
disrupt86 Reviewed by disrupt86 on . fan/ventilation question im kinda confused on the whole fan situation i was going 2 get a Vortex PowerFan but i dont get if i need 2 of them or if the other fan is a different type(one for blowing out air one for blowing or sucking in fresh air) .... if someone could please describe 2 be how it works i would appricate it greatly Rating: 5