Yes Russell, it is of great interest to me, thank you. On Friday lunch break I found NZS4541:2007. It is not free. I also refreshed my memory on RTI. Since it is based on temperature AND velocity of the heat, given "RTI=36", without knowing the rated temp, one does not know if the length unit is meter or feet. As an aside, I am also interested in questions such as "which will activate first, a 135F SR or a 200F QR"?, and I am becoming able to answer it :). Thanks again, Brad
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