um is this right?

so my room is 10x12x9 and im trying to figure out what size intake or exhaust fan i would need. from what i have read you multiply LxWxH to get cubic volume of room. so that would put my room at 1080 cubic feet, so if i wanted to cycle the air in the room 3 times per minute i would need a 3240 cfm fan? If thats correct, is there fans with cfm rating that high cause i cant see to find one online, or would i need more than one intake fan..............i think i doing something wrong

Look for a fan that can exchange the air every five minutes; it doesn't have to exchange it every minute.

Something like this would fit your needs:

http://www.bghydro.com/BGH/itemdesc.asp?ic=AEFCF08HO&eq=&Tp=

ok cool so doing it right just trying to move to much air. k cool. anyone got suggestion for which brand for intake and exhaust fans, looking for the most quiet fans i can get.

oh also is it true i want more exhaust cfm than intake cfm?

Yes it is, you want a negative air pressure. I dont use an intake fan myslf, just passive intakes. But if u are it should be smaller than the exhaust.

I don't know if your math is off but I will tell you you can't replace that volume of air in a minute. Not unless a hurricane blows through your house. My 8" can fan removes 700CPM and it's quite powerful.