For those of you installing mini-splits or window AC units in your shops, you need to consider providing some way to keep the sawdust out of them. A large box with a pleated furnace filter connected to the air inlet of the unit is the best way. If you don't do this, the coils in the indoor unit will quickly collect sawdust as the shop air passes over the cold and moist coils inside the AC unit, reducing the capacity of the unit.

Charley