Fire-resistant windows are special windows with the ability to withstand fire. Their construction and ratings are designed to effectively prevent the spread of flames and smoke during a fire, ensuring sufficient time for evacuation and rescue. The construction and ratings of fire-resistant windows are typically classified according to international standards.
Construction: The construction of fire-resistant windows is designed to resist the intrusion of fire for a certain period. Common construction features include:
Fire-resistant glass: Special fire-resistant glass with high-temperature resistance is used to prevent breakage and block the spread of flames and smoke for a specified time.
Fire-resistant frame: Fire-resistant windows often use metal frames, such as steel, with high-temperature resistance to maintain the window's structural integrity.
Sealing materials: The sealing materials used in the windows prevent smoke and flames from entering indoors, reducing the risk of fire propagation.
Ratings: Fire-resistant window ratings are typically based on their fire endurance time, indicating the duration for which the windows can maintain their integrity and isolate flames. The commonly used international fire-resistance rating system, according to EN 13501-2 standard, includes the following levels:
E30: The window can maintain integrity and isolate flames for at least 30 minutes during a fire.
E60: The window can maintain integrity and isolate flames for at least 60 minutes during a fire.
E90: The window can maintain integrity and isolate flames for at least 90 minutes during a fire.
E120: The window can maintain integrity and isolate flames for at least 120 minutes during a fire.
Note: Different countries may have different standards and rating systems. When purchasing fire-resistant windows, it is essential to comply with local building regulations and standards to ensure that the chosen fire-resistant windows meet the necessary requirements.