Expert anti-valve bias: most elastomerics have exhalation valves
And to be clear, I don’t think any of these reasons are enough (although, this somewhat depends on when in the pandemic these reasons were used) to justify not recommending the use of elastomerics.
Here’s another reason I forgot to mention:
Expert anti-valve bias: most elastomerics have exhalation valves
And to be clear, I don’t think any of these reasons are enough (although, this somewhat depends on when in the pandemic these reasons were used) to justify not recommending the use of elastomerics.