In workshop we use 3M 6035 particulate filters - they have very low flow resistance and are cheap. They are P3 rated - equivalent to N100, but connecting blower to them would probably be difficult. 40mm threaded particulate filter would be perfect - it would be really easy to connect both fan and air tube. I use MSA PlexTec P3 filters with Drager gas mask when sanding epoxy (it looks silly, but epoxy composite dust is nasty and shouldn’t get into lungs or eyes):
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