how does the fire endurance of first rate fire resistant window?
the classes are different. class A window not less than 1.5 hours, and the time is short, class B window not less than 1 hours, with shorter time, Class C window not less than 0.5 hours.
class A window not less than 1.5 hours, class B window not less than 1 hours, Class C window not less than 0.5 hours.
how does the fire endurance of first rate fire resistant window? I really don't know it and I need a specific direct and detailed answer!
