Will fresh, pumped, HEPA13 filtered (99.9 PM2.5) air do?
Dad suffers from Hypercapnia and normal masks drop his blood oxy levels dangerously.
I got us these “Broad AIRPRO” rechargeable masks that use a replaceable filter in a little box with a Micro-USB rechargeable camera battery and a fan, that comes with replaceable masks, or you can punch a half inch hole in any mask to use the system with. ($65 or so on Amazon)
At least with this, my dad can still function under this tyranny.
(That’s not me! I’m an old man.)
If you adjust your breathing to wait a moment after exhaling, before inhaling, then this device saves you from reprocessing your exhaled toxins, an activity we were neither designed nor “evolved” to perform effectively.
Three speeds, and it can run even while recharging from a USB power bank. These seemed the best available solution, and replacement parts and filters for them can also be had.
We don’t leave home without them, for when we are forced to “Comply”.
~Easy