I set up my carbon filter inside my closet to catch the skunk dank smell and connected it via a flex tube to a fan outside the closet. My closets are not air tight, so clean air is drawn in through holes, leaks at the door, et al to flow through the carbon filters to catch stank. The air goes out via a flex vent tube to an in line fan, then out to my basement, where the closets are located. One closet is for veg and drying, the second is for bloom. The drying rack also double duties as a clone machine when not drying herbs.
I also have small fans to circulate air inside the closets. They run 24/7 because of smell. The small fans keep moistu re/condensation low. Heat is not an issue, LEDs are cool running.