Definitely no moisture, have a 7.5 hp screwdrive compressor with a refrigerator dryer, 30' of 1" copper after it and then a water trap and filter to 3/4" PVC (previous guy set the shop up with it) and then a m-60 filter in the booth. Unfortunately this motor is not adjustable so we cant put a rheostat on it, that was the original plan. Someday will be putting an adjustable motor in their to be able to bring the fan way down between coats. Don't necessarily like the idea of killing it between coats as i don't want trash falling into it. No reducer and no die back issues, i am beyond impressed with SPI products to say the least. I do kill the fan after last coat just not as fast as the tech sheet says. Again, no issues and clear looks excellent the next day, I'll start killing the fan sooner after last coat to ensure i never have an issue.