I took my exhaust fan off and put a reversed pump from a blow up bed, between the outside of the exhaust and the outside. It has a stronger pull and sucks the exhaust out of the Glowforge. It’s amazing how much better and cleaner my Glowforge cuts now. It also helps to have a compressor running at about 10dpi with the hose converted to a small tube that I put in the front pass through slot. It stops scorches and always cuts clean through wood.