Why would I want to pull air from the outside? The smelly air is inside the tent. You must mean from outside the filter, that is more or less the way I had it setup. Except I was also pulling the air through the cooltube. I think your suggesting to pull throught the filter but push through the cooltube and out, right?If the fan is hooked up strait to the filter, pulling air through. The fan will then be pulling odor from the outside, so its clean air filling up the inside of the filter, then its clean air going through your ducting and cooltube, that will eliminate any odor leaks.
If you push through the filter, your filling up all your ducting and your cooltube with odor and even your fan is being filled with pressurized stank air, which can lead to more leaks.
I always prefer to pull, that way all the exhaust air running through my ducting is pressurized and clean so it cant be contaminated on its way out.
Right now I'm pushing through the filter, but it's the very last step. If the smelly air leaks anywhere it will be back into the tent so it doesn't really matter. Unless it leaks where the vent connects to the filter, but it's not.
Your suggestion does make a lot of sense and I would have set it up that way a couple hours ago when I changed it, but I think the way I have it now will work just fine. If it doesn't I'll be sure to try your suggestion next.