On 2020-06-29 12:10, Bob F wrote:
On 6/29/2020 7:33 AM, Ralph Mowery wrote:
In article , says...
But these valves are meant to make breathing out easier, right? while
using the rest of the mask to filter the air that comes in, right?Â* It
seems that vents like this defeat the so-called goal of masks, to
protect the other people.


The valves make them useless for protecting others, so they offer little
aid in reducing spreading.



Most masks are almost worthless.Â* The n95 masks are made to work in a
contanimated area.Â* They are to keep things out of you and not what you
breath out.Â* The virus particals are too small to be filtered going into
you.

The home made cloth masks soon fill up with the moisture and then become
ineffective.

There was a very good write up on this that was published on Facebook.

Facebook????Â* What kind of reference is that?


Did the article on Facebook give cites we could look at?