Which standard must fire dampers comply with for testing requirements?

Fire dampers are critical components in HVAC systems, designed to prevent the spread of fire and smoke through ductwork. The correct standard that outlines the testing requirements for fire dampers is UL 555. This standard includes various performance tests that ensure the dampers will perform effectively under fire conditions, such as integrity and leakage tests at specified temperatures.

The focus of these tests is to certify that the fire damper will remain intact and function as needed during a fire incident, thereby protecting the areas of a building from fire and smoke damage. Compliance with UL 555 ensures that the dampers meet essential life safety and property protection standards.

Other standards mentioned, such as UL 543, UL 555S, or UL 575, pertain to different aspects of fire protection systems or other types of equipment. However, UL 555 is specifically designated for fire dampers and their required performance during fire situations, making it the correct choice for testing requirements.