In the Chinese national standard, Class A fireproof window refers to a high-standard fireproof window that meets certain requirements for fire stability, fire integrity and fire insulation performance. According to GB 12955-2008 "Fire Windows", Class A fire windows can provide critical time for personnel evacuation and fire control in the event of a fire.
According to the standard, Grade A fireproof windows should meet the following key technical parameters:
1.Fire Duration: Grade A fire windows must be maintained at least 15 hours of fire integrity and thermal insulation, i.e. no damage to the form structure and the ability to limit flame and heat transfer for a specified period of time.
2.Fire Integrity: Under extreme heat, Class A fire windows should be free of combustibles falling and flames should not spread through any gaps in the window to the non-fire side.
3.Fire and heat insulation: The temperature rise on the other side of the window (the non-fire side) should not exceed the specified value, so as to ensure that the high temperature on one side of the fire source will not be easily transmitted to the other side, so as to avoid causing secondary fires or posing a threat to the evacuation area.
4.Material requirements: Grade A fireproof windows are usually made of materials with excellent fire resistance, such as high-temperature resistant special glass, steel frames, sealing strips and filling materials, etc., which can ensure that they remain intact under high-temperature fire conditions.
In order to meet the standards of Class A fire windows, manufacturers must use raw materials that have been tested for fire performance and have been approved when designing and producing Class A fire windows, and ensure that the products meet national quality control standards at every step of the manufacturing process. In addition, the finished product must also pass the type inspection of the fire window of the National Fire Protection Building Qualification Assessment Center.
Although the investment cost of Grade A fireproof windows is higher than that of ordinary windows, their excellent fire performance can effectively divide fire protection zones, delay the spread of fire, and gain valuable time for the safe evacuation of personnel in the event of a fire accident, so it is particularly valued in the field of public safety.
In short, the national standard for Class A fireproof windows sets high standards of fire protection requirements in the industry to ensure the safety protection of life and property in emergency situations. For any building facility that needs to enhance fire safety, it is a rational and effective decision to choose a Class A fireproof window that meets national standards.