I have a third party agency report for a Fire Curtain, The report is identifying that ITM is required to be inspected 4 times a year.
Your interpretation will be helpful
NFPA 80 (2016 edition) paragraph 21.9.1 clearly states "Periodic inspections and testing of fire protective curtain assemblies shall be performed not less than annually."
That means testing at least annually will meet the intent of this requirement. Testing less frequently than annually would not be in compliance with this requirement. You might want to check with your AHJ and ask if they have a definition of "annual"? Some AJH's will say a test any time in 2015 and a second test any time in 2016 is ok. Other AHJ's will say a test in Jan 2015 and the second test in Dec 2016 is 24 months between tests and not acceptable.
Testing more frequently than annual (i.e semi-annual, quarterly, monthly, etc.) is permitted, but is not required. Quarterly testing will certainly help your service providers bottom line more than your own and this is but one example on how service providers can mislead owners on what is and is not required by code.
There is a lot to be said about a service provider you can trust to be completely honest with you. If they are not being truthful about testing frequencies then what about repair/replacement parts that are needed, what can be repaired vs what needs to be replaced, and everything else they do for you that you often need to rely on what they tell you?
In certain situations, voluntary, more frequent than required testing may be prudent for you to consider; for example: assemblies that are nearing the end of their useful life, assemblies which have had a troublesome maintenance history or are frequently damaged, the consequence to business operations should the assembly not be able to perform as required in an emergency, etc.
Retrieving data ...