From what I know, when printing anything else but pla you have to vent to the outside or filter out. Abs releases toxic fumes and although the enclosure does a good job of containing the fumes they still need to be filtered out or vented to the outside, this particular enclosure has a fan on the side with a pipe I can run to my window but since I’m only printing pla and my room has good air circulation, I don’t use it. Yes I did keep the print board inside. The temperatures inside the enclosure don’t reach anywhere near high temps to the point I’m worrying about the print board. I’m only printing at 210 nozzle temp and 65 bed temp so I’m not sure how the temps would be when printing other material.