What is the minimum fire resistance rating required for corridor dampers?

The minimum fire resistance rating required for corridor dampers is 60 minutes because this rating ensures that the dampers can effectively withstand fire conditions for a significant duration, which is essential for maintaining safety in a building. Corridor dampers are crucial in preventing the spread of smoke and fire through a building's corridors, especially in commercial and multi-family structures where occupants may evacuate through these areas.

A 60-minute rating aligns with standard fire protection measures and is designed to provide adequate time for evacuation, allowing for smoke control and limiting the exposure to flames. This time frame helps protect both life and property during fire emergencies by giving the necessary buffer before the structural integrity of the damper may be compromised. Therefore, the requirement for a 60-minute fire resistance rating is crucial to meet safety codes and uphold fire safety standards.