What standard must fire dampers comply with?

Fire dampers must comply with UL 555, which is the standard that outlines the requirements for the fire resistance ratings and testing methods for fire dampers. This standard is essential because it ensures that fire dampers are capable of effectively restricting the spread of fire and smoke through ducts, HVAC systems, and other openings in fire-resistance-rated barriers.

The UL 555 standard covers various performance criteria, including the damper's integrity during a fire situation, its ability to close and maintain a seal, and its operational safety upon activation. Following this standard is crucial for the safety and compliance of building systems with applicable fire safety codes and regulations.

While NFPA 90A also addresses the installation of fire dampers and their role in maintaining the integrity of fire-rated walls and floors, it primarily focuses on the broader context of ventilation systems and does not specify the performance testing of dampers themselves. ASTM D5600 is not directly related to fire dampers, and SMACNA Guidelines provide guidance on the installation of HVAC systems but do not set specific standards for fire dampers. Thus, UL 555 is the correct standard for fire dampers.