Never had a problem with the blower motor but I only painted about 6 cars in the past. Can’t remember if the furnace filters used to filter the over spray were on the inside or outside but remember it was a sheet metal box big enough for two or three 20/25 filters. I think the fan blowing in will stir up a lot but if you can block it off and make it so it doesn’t blow like a hair dryer then I guess it may work. I also did a few other things when I painted like putting a chain over the tailpipe. Don’t know if this did anything but grounded the vehicle from being on tires. The compressor I used got warm so I also would use copper pipe from the compressor to the tank curled up and around going into a five gallon bucket of water the water would be warm after painting and also wet the floor with a broom. This was my redneck way but it worked for me.
