What is the maximum allowable glass size in a 1-1/2 hour fire door?

The maximum allowable glass size for a 1-1/2 hour fire door is 100 square inches. This specification aligns with safety codes and standards that govern the use of glazing in fire-rated assemblies. Fire doors are critical components designed to contain smoke and fire within specific areas, ensuring the safety of building occupants and facilitating safe evacuation.

When considering the maximum glass size, it is essential to account for the fire-resistance rating of the door. In this case, a 1-1/2 hour fire door has been tested and approved to withstand fire for that duration. The limitations on glass size are in place to minimize the risk of glass breaking in high heat scenarios, which could compromise the integrity of the fire-rated door and allow flames or smoke to pass through.

The choice of 100 square inches reflects a balance between functionality—allowing for visibility and light—and maintaining the fire-resistance capabilities of the door. Other options exceed this size and would not be compliant with the fire safety standards, which are designed to protect lives and property in the event of a fire. Understanding these parameters helps ensure proper installation and adherence to building codes, ultimately contributing to fire safety in construction.