So to update I have gone with the 600watt light cool tubed to keep the temp down in the room.

3x 6" fans have a total of 350+ cfm

I essentially wanted to have 1 fan for the cooltube, and 2 for the exhaust with 2 homemade carbon scrubbers.

Do you think 2 home made carbon scrubbers with 2 fans of 125cfm will suffice in masking the smell?
I have read that too high of a CFM for homemade carbon scrubbers can counteract the use of the filter, something to do with pressure? So I'm even thinking of using 2x 70cfm fans for each filter totaling 140cfm filtered.

The third fan for the cooltube will be a blower rather then exhaust.

Thanks!