Respuestas al mensaje #2,294

If you don't care about protection from chemical warfare agent or other vapors, a very long time. Just replace them when they get clogged.

The 3M disposable ones I saw today had a use-by date in 2024.

40 Hours/30 days use if its a 3M combo cartridge in an oil aerosol environment. In a sneezy cough virus aerosol environment? I wouldnt go longer...