Are there any masks with "reverse" valves that lets you inhale unfiltered and fresh air and only filters out exhalations (droplets etc).
I'm asking as someone who:
- has a beard, so most masks won't really help protect me
- is low-risk
- has antibodies
- has a recent negative test
- only wears a mask when asked to (indoors within 6 feet, or on a plane etc).
This would let me breathe fresh air while protecting those around me on the slim chance that I have Covid...