I decided to go with a mini-split heat/AC for my new woodshop (see the cinderblock barn to woodshop thread elsewhere on this forum). One of the concerns I have is dust getting into the wall unit. I recall seeing somewhere on the web (could have been Sawmill Creek, or maybe some other ww forum) where some folks have made a plywood box that holds filters and fits over the interior wall unit. Has anyone here done something like that? Any advice to offer? Types of filters used? How well has it performed?
Thanks!