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NFPA 80  requirement for swinging fire Doors

Question asked by cynthia.reynoso on Apr 23, 2018
Latest reply on Apr 27, 2018 by lrojasmz

I am working in the development of a fire rated door and I have some doubts about the hinges required , for this doors ando also about its placement.  Is it ok to use ballet bearing hinges and to instalo them surface mount ?

Regarding the core material is there information about its density or characteristics ?