got the plans for a diy carbon filter with activated carbon etc... using a pc fan but what i want to no is will it be strong enough, i have 80mm 12v one but it dosnt seem as though it will be strong enough to pull air - any ideas? also is there any other ways of getting rid of smell? my grow room is in cm: (W)72, (H)94, (D)50 just so u got an idea of what im working with,, also got a 250w digital ballast/reflector and mh and hps bulbs,, havnt actually started my grow yet as i am planning it all out first so any other info will be appreciated and how many plants do u think i could grow with the space and lights i am going to use? MANY THANKS.