Can someone tell me were in NFPA-13 dose it talk about the C-Factor for pipe. I am doing a calc. on an old system and I know I have to change the C-Factor but I can not find it in the code book. I found it somewere elese and it says in old pipe i must change the C-Factor like new black pipe for wet systems will be 120 C-Factor but if its 50 years old I must chage it to 90. Can someone tell me were to find this info. Thank You
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