Which glass type is permitted for use in some fire doors?

Which glass type is permitted for use in some fire doors?

• A. Wired glass
• B. Laminated glass
• C. Tempered glass
• D. Float glass

Answer: (A)

Glazing in fire doors must stay in place and help maintain the door’s fire-resistance rating during a fire. Wired glass is allowed in some fire doors because the embedded wire mesh holds the glass fragments together as it heats, reducing the risk of large shards falling and helping the door keep its barrier intact for the required time. Float glass, being ordinary glass, tends to fail quickly and isn’t suitable for fire doors. Tempered glass, while strong, can still fail in a way that doesn’t meet all fire-door requirements, and laminated glass depends on the specific assembly and rating, so wired glass remains the option permitted in certain door configurations.

Glazing in fire doors must stay in place and help maintain the door’s fire-resistance rating during a fire. Wired glass is allowed in some fire doors because the embedded wire mesh holds the glass fragments together as it heats, reducing the risk of large shards falling and helping the door keep its barrier intact for the required time. Float glass, being ordinary glass, tends to fail quickly and isn’t suitable for fire doors. Tempered glass, while strong, can still fail in a way that doesn’t meet all fire-door requirements, and laminated glass depends on the specific assembly and rating, so wired glass remains the option permitted in certain door configurations.