What is a level of fire. Secondary fire, three fire (steel)
1, which refers to the fire resistance of building materials grade 2, the steel structure, the use of components in different parts, according to the requirements of the fire level must meet the different refractory limit. For example, a fire rating of the pillars, fire resistance limit of 3h, two refractory grade pillars, fire resistance 2.5h, three of the 2h; for the beam, then, one, two, three fire rating, the fire resistance For 2h, 1.5h, 1h. Steel is usually only 15 minutes of fire resistance, so in this case, are to brush fire protection.
Is to see you fire for hours. General secondary fire is 1.5 hours it
Code for building design fire protection
