Which type of glass can be used in fire doors?

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

Answer: (A)

In fire doors, glazing must stay in place and continue to act as a barrier during the fire. Wired glass has a continuous wire mesh between layers that helps hold the glass together if it cracks, which keeps the door's opening more intact for the required time and reduces the risk of falling shards. This structural restraint is why wired glass is allowed for fire door assemblies in many codes and testing standards. Ordinary float glass would not provide this level of performance and would fail more quickly under heat. While tempered and laminated glasses offer safety advantages in other applications, wired glass is the option specifically associated with maintaining door integrity in fire conditions, making it the best fit for fire doors in this context.