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A member asked:

I just bought a new israeli 4a1 nbc gas mask and i was wondering i could use the filter after its expired?

A doctor has provided 1 answer

Yes: Depending on what you are hoping to use it for, it will work for a while but you can't depend on it to work against biological warfare or nerve gases after it has expired.

Dr Ferdowsi and another doctor agreed

Answered 3/20/2015

6.2k views

Thank

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