Question about carbon filter install OUTSIDE of tent?!

I have always gone with the standard carbon filter setup at the top inside of the tent. This time I’m vegging an additional month, and going to do icarbon filter outside of tent, to give me extra height for the LED light. Are carbon filters any less smell effective in this new orientation? The videos I have seen instruct to place the prefilter on the inside of cabon canister and run ducting straight up and through top of tent. My main concern is I’m very particular about smell. I usually run a recycled older filter even in Veg when things start to get a little musky, and then switch to a new fresh cabon filter in flower. Even then they are about 90-95% accurate it seems. I still have a little sweetness in the air during weeks 6-10…..and have a plugin inside the lung room, and an ona gel.

I always run my fan and filter on the outside just fine. Clogs faster but I get cheap 4" filters off Amazon for like $25

All of mine run on top of tent to make way for boxfans and no issues. It can clog faster but like one said I get the vivosun ones they arent too expensive. I done 3 grows like that so far so good.

Pretty sure you can add a prefilter still im not sure how. Id imagine on the duct port somewhere maybe a special flange. A coarse filter as I want maximum airflow to maintain rh. I been meaning to put a pollen grade filter around the carbon part to run new strains so if they herm the pollen wont spread.

I read pollen drift is mostly from opening tents tho.

Construct a box to place on outside of tent largest enough to hold filter with fittings the size of your ducts. Draw air from tent into box. Exhaust air from box by drawing through the filter and outside the box to the vent fan. The box, filter, and vent fan are all outside of tent. Basically the box becomes becomes a secondary chamber of the tent.

If you have your carbon filter outside the tent: use minimal length ducting between tent and filter and be extra careful about it being air tight. The benefit of having the carbon filter inside is that any air passing into ducting automatically needs to pass the filter. With it outside any air escaping the ducting between tent and filter will be unfiltered and smelly.