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Outside of RTI value on a sprinkler head,what is the primary differance or definition between a Quick Response head, and a Fast Response head ?

Question asked by richard.raab on Dec 5, 2016
Latest reply on Jun 8, 2017 by richard.raab

NFPA 13 does not give a clear definition on the differences. I am an Instructor and this is a frequently asked question from first year apprentices.We explain RTI values and hazard classifications., ie., Quick Response is in Light Hazard applications.1/2" head, Fast Response has an RTI of 50 or less. Any definition between the two would be greatly appreciated.