My garage is my shop. I typically work the the double garage door fully open to give me more light and some breeze. During the summer months I have a 24" fan at the back of the shop blowing toward the door to provide additional circulation. I have a Grizzly 3HP dust collector with a 2 micron filter that I use with each of my big machines and I have a shop vac that I attach to my power sanders when sanding.
Given all that, how much (if any) benefit is there to adding room air filter such as those by JDS?