i see your problem with the pics... i dunno whats up with it, but yeah do a test run and see how it goes, if worst comes to worse try and find a high cfm can fan not a squirle cage, something in the 300+ range thats an in-line fan, they provide mucho static pressure for the filter. you dont want to create pressure in the cab, the smell willl push its way out, so u want to be pushing more air out then in, besides your problem seems to be getting the air out not in, so worry about getting it out. i had the same problem. Also your veg chamber... if your not running hot lights in there, u dont need a high amount of circulation.