UL 555 Fire Dampers – Standard
UL 555：Fire Dampers
UL 555 Fire Dampers – Scope
1. The fire dampers covered by these requirements are intended for installation in accordance with the National Fire Protection Association Standard for Installation of Air-Conditioning and Ventilating Systems, NFPA 90A, the International Mechanical Code and the Uniform Mechanical Code.
2. Fire dampers are evaluated for use as either:
a) Fire Dampers for Static Systems – For HVAC systems that are automatically shut down in the event of a fire or for air transfer openings in walls or partitions,
b) Fire Dampers for Dynamic Systems – For HVAC systems that are operational in the event of a fire,
c) Combination Fire and Smoke Dampers – For locations in HVAC systems where a fire damper and a smoke damper are required at a single location, or
d) Corridor Dampers – For locations in HVAC Systems where air ducts penetrate or terminate at openings in the ceilings of interior corridors when permitted by authority having jurisdiction.
3. These requirements do not cover:
a) Performance of the fire damper assembly in walls, partitions, or floors constructed of materials other than those tested.
b) The performance of the fire damper assembly when installed using methods other than those fire tested.
c) Measurement of heat transmission through a fire damper assembly.
d) Measurement of the degree of control or limitation of the passage of smoke or products of combustion through the fire damper assembly.