I run one with 10" and 6" caps, and hook it right into a 6" fan. This way it has 2 inches of filter media to pull through on every side, plus its about ~ 3 feet tall. I use kitty litter in mine and no-one can smell a thing

The whole room is vented through it like this (Scrubber)(Inline Fan)(Ducting) (LIGHT) (Exit Port), so its sucking through the filter and blowing de-stinkified air across the light. My friend doesn't air cool his light, so the filter is hanging right above the light fixture connected to a fan blowing out, and sucks heat/stink out from right above the light.

They work awesome, I wouldn't even think of not using a scrubber of some kind in any grow. Even the nice smell of a full room in bloom can get a little old after years