Your Opinion on 40mm NATO NBC Filter Specs for COVID?

I'm curious what the forum members will answer back with.

What is your opinion on the smallest form factor 40mm NATO filter that would be effective against COVID?

In the USAF, when I had a need to get new training filters, I went to a section of supply and just handed over the paper work, and I got a training filter. It was a filter rated more for nuclear environments, and was out of date in a well sealed package. I've never had to personally pick out a filter.

Wanting to get an NBC mask and filter to actually Add To Cart and SHIPPED, I rushed the process a little bit.

The photo in my other thread shows a filter that is highly rated by the online community and is made in Italy. It has the rating of A2B2E2K2P3RD; and I only have a novice level understanding of what this means.

The goal is to get two(2) low profile and low restriction filters that are only a little better at keeping COVID out of my lungs. I think my current single filter is way, Way, WAy, WAY overkill, and I'll happily use it till I figure it out.

NOTE: The build quality of filter I have looks really good. The filter has zero leaks that can be detected by observation or testing. While doing the shopping experience I did not detect any smells/odors; it was just clean breathing with a little more lung effort and amazing air flow inside the mask for the extra effort.

NOTE 2: Some filters seem to have the 40mm mount as concave instead of convex. I think some of the concave filters might fit the Avon C50 nearly as tight to the cheek as the M50 filters.

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Your Opinion on 40mm NATO NBC Filter Specs for COVID?