This standard NATO-threaded filter made by Mestel Safety features a hefty P3 rating that trivializes the hazards of many household project particulates, viruses, mists, fumes, and dust.
While it's not intended for use against chemical agents, it (paired up with a full-face protective respirator) can still be your best friend during home projects that deal with fumes, dust, or other airborne particulates. If you live in high-risk brushfire areas, it can also act as a means of protecting your respiratory system during "shelter-in-place" or evacuation scenarios in conjunction with a full-face respirator.
Re-usability & How to recognize end of service life
The end of this filter's service life is generally recognizable by a noticeable taste or smell of the contaminant, an increased breathing resistance and combination of the two - a variety of factors can change how long this filter lasts, including breathing rate of the user, temperature, air humidity, and contaminant concentration.
The user should replace the filter when they begin to perceive the smell or taste of the dangerous substance or in case of irritation, or when respiratory resistance becomes too high.
These filters are marked 'R' for reusable, meaning they can continue to be used at their rating until the end of their service life (as noted above).
What does 'P3' mean?
This filter has a P3-rated particulate filter that filters 99.95% of airborne particles such as:
Specs