I think I read where putting your scrubber on the very end of your inline fan is actually the better way of doing it , cause of CFM ( cubic feet per minute) . Sucking air through the carbon filter can associate with heat in some way , if you don’t have the right model inline exhaust fan , because of rating and the operating of the inline fan ability of pulling air through the carbon scrubber at a rated measurement . I have my scrubber inside my tent , connected to with vent tubing running out the top to the fan that sits on top of tent , and I have a 6 inch duct fan blowing fresh air inside the tent from the bottom . Lately , since I’ve added 400 more watts of Led lighting , my temps have been around 84 degrees max . I thought setting it up that way , would help the hot air to be removed from the top since hot air is lighter than cooler air and rises to be extracted from the top of the tent . But I’m going to make a few changes after my blueberry finish . I think I’m going to put scrubber on the end of the CFM inline fan where air blows out threw it , and just put ventilation tubing in the bottom vent hole , and put 6 inch duct fan tubing through the top . This way I’m thinking the cooler air will push the hot air downward , and also help cool off lights at the same time , and the inline fan I have is rated 190 CFM I believe with controllable switch , which is strong enough to suck all four walls on my tent inward like a vacuum seal , but with the 6 inch duct fan it helps keep it blowed up kind of to where I have good air moving , but like I said earlier , I’m thinking of changing the way I have set up now , to what I just stated . Attached scrubber on air out side of CFM inline fan directly , than run tubing in bottom vent hole in tent with some kind of modification to suck air from the bottom , and put 6 inch duct fan on the top in that vented hole , which might help keep my temps at 72-78 degrees .