Not to hijack this thread, however, an air compressor should be standard equipment in a dust making shop...
Dust collects everywhere. Light Switches, Outlet Boxes, Machine Switches, Motors, Fans, Inside Housings.
This Dust is that Nasty Fine Dust that is Smaller than.05 Micron, Your Normal Hair is Over 1.0 Micron... This is that fine Silky Dust that coats fyour clothes and Hair and settles on everything in the shop.
Protect your lungs when you use that compressor to clean it out of all the nooks and crannies where it gathers...