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Do N95 Face Masks Expire? Researchers at University of NC and EPA tested brand new & 10 year old expired N95 face masks The oldest masks had expired 11 years before the study if the expiration lifespan is 5 years, that means the oldest masks were 16 years old smartairfilters.com/en/blog/do-n...

smartairfilters.comSmart AirDo masks expire? Scientists tested new and expired masks to see if N95 masks expire. Tested on real people, even 10-year-old N95s were as effective as new.