https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm?ID=K200923
October 30, 2020 , The National Institute for Occupational Safety and Health (NIOSH) approved the 5 years shelf life extension of TC-84A-9221 for the model DE2322 N95 air-purifying filtering face piece respirator. The user instructions are revised to change the expiration date from two to five years and the storage temperature as per recent validation reports.