This is really stupid. An airplane where everyone wears P100 respirators is clearly preferrable to one where everyone wears unvented N95 masks, yet this wouldn'

This is really stupid. An airplane where everyone wears P100 respirators is clearly preferrable to one where everyone wears unvented N95 masks, yet this wouldn't be allowed because all P100 respirators are vented. The only masks that don't have vents are lower quality paper masks that don't seal along the edges. They can't seal along the edges because masks without a vent don't magically force all of your exhaled air through the filter -- your exhaled air goes out the sides. The point of a vent is not to bypass the filter (Unless you have a backpack sized filter, that's going to happen regardless). The point of the vent is to control how and where exhaled air leaves the mask. Controlled exhaust is arguably more important in an airplane where you're sitting side to side with other people, because uncontrolled exhaust from an N95 mask goes straight into the face of the person sitting next to you. P100 respirator exhaust can at least be directed into your lap.