Re: 1813:
“Frequently Asked Questions: 3M Health Care Particulate Respirator and Surgical Masks Storage Conditions and Shelf Life”
https://multimedia.3m.com/mws/media/869238O/3m-health-care-particulate-respirator-and-surgical-masks-storage-conditions-and-shelf-life-faq.pdf
Thanks. Link bookmarked, file saved. Shortened both the link name & file name a bit, tho’!!