So the issue with a lot of respirators and dust masks is the exhalation valve which is totally unfiltered. This makes them pretty useless for COVID-19 safety. You can read more about what the CDC says about masks with valves.
Everything I used for this 5-min hack:
- 3M Rugged Comfort Half Facepiece Reusable Respirator 6502QL (Medium)
- Electrical tape
- Non-Woven Polypropylene Fabric (woven fabric will work too)
Check out the gallery below to see how I added a filter to my valve. I specifically added it to the outside so it would last longer before getting moist and so others could see it. I used two layers of material for the filter.