Damper Inspections What to look for.

NFPA® 80 Standard for Fire Doors and Other Opening Protectives Handbook 2016
19.5.1 Testing Frequency.
19.5.1.1 Each damper shall be tested and inspected 1 year after acceptance testing.
19.5.1.2 The test and inspection frequency shall then be every 4 years, except in buildings containing a hospital, where the frequency shall be every 6 years.