curprev03:4703:47, 28 December 2020 81.97.116.199talk 11,929 bytes−32 A fire resistance period of say 90 minutes simply indicates that a fire resistant member should be able to resist the same 'severity' of fire (temperature * time) as the the standard fire after 90 minutes. It's does not indicate the time that a firewall should resist the spread of fire.undoTags: Mobile editMobile web edit