IMPORTANT: Here's a potential source for filter masks.

[KY_EnviroGuy]

3. Feel free to pass it on because I don't use social media.

I would guess many of these companies have many dozens of these masks if not hundreds in stores warehouses. They keep a lot around for regular maintenance and scheduled outages.

Same with Tyvek protective suits. They buy them by multiple case lots and in two or three sizes.

Chemical plants would have lots of rubber gloves.

These are a few of the types of plant that would have this stuff in quantities:

* Power plants.

* Paper mills.

* Cement plants.

* Steel and aluminum mills.

* Grain and food production plants where grains and flour are handled.

* Glass plants.

* Chemical plants of all sorts.

* Refineries.

* Mines and ore refining plants and rock crusher plants.

Other:

* Industrial construction companies.

* Industrial service companies.

* Industrial vacuum truck and hazardous waste companies.

If you call such companies, ask for their plant manager, assistant manager or the chief safety officer.

I know these things because I worked in those industries for many years and used those items.