Carbon Filter Hookup?

Just got finished reading #23 already asked questions about how to make a cool tube... diy carbon filter. the only thing i am unclear about is how do i hook this to my exhaust?
I have 2 tents, a 3'x2' and a 5'x5' both hooked to a 6" cfm fan. the flexible exhaust hoses are connected to a cool tubes around the lights to keep the tents cool. My question is where do i hook this DIY carbon filter? Does it hook into my current exhaust or do i gotta hook it up to another fan? I have another fan if that's the case

You will if you air requirements arent met after hooking it up. If not you you can attach it to run of ducting near the intake

this is not a trusted route and thats cuz i wouldnt run 1 fan 2 tents,but if i did it would by running ducting to both off of a single blower pushing thru the scrubber,like this>>scrubber with a sealed fan attached with 2 way splitter off of fan, then ducting routed to the tents sucking air out faster than you can bring in. then sucking air through ducting into fan and then passing the air through the scrubber before leaving phresh!size of fan is key to sucess here i guess! im stoned hope its cool!