So this is from a prepper
When folks ask about gas mask etc
Why?
To do it really well - it’s extremely expensive.
I mean you can get a mask but then you have to factor filters and then learning how to use it properly and fit it to that person. Facial hair, small faces. Improper seals. Then also note this is really only a temporary fix. What’s the long term plan?
Meaning do you have a sealed room with a NBC filter someplace?
Resources is limited. I would say spend it on someplace else that you may be needing for your prep.
But as with everything. If you must. Here’s a lead
http://www.ventusrespiratory.com/collec ... espiratorsYou can also consider commercial respirators - like ones for painting etc.
Also not cheap but look into PAPR
Powered Air Purifying Respirator