What is the general requirement for fire doors in stairways regarding temperature rise during a fire test?

The correct requirement for fire doors in stairways regarding temperature rise during a fire test is that the temperature should not exceed 450°F. This standard is established to ensure that the fire doors effectively serve their purpose of preventing the spread of fire and smoke, thereby providing a safe means of egress for occupants during a fire.

Fire doors are tested for their ability to withstand fire for a specified period while maintaining their strength and integrity. A temperature rise of more than 450°F indicates that the door is not performing adequately and could potentially compromise safety by allowing heat and smoke to penetrate the stairwell. This could endanger occupants trying to evacuate or firefighters entering the building.

It is essential for fire doors to help maintain a safe environment in areas such as stairways, where escape routes must remain accessible and protected during a fire emergency. Hence, the standard temperature limitation is critical for ensuring these safety features are effective.