Which UL standard must dampers comply with according to the code?

Dampers are a critical component in HVAC systems, playing a vital role in controlling air flow and maintaining indoor air quality. The correct UL standard that dampers must comply with is UL 555. This standard specifically addresses the requirements for fire and smoke dampers, focusing on their design, performance, testing, and installation. Compliance with UL 555 ensures that these dampers can effectively prevent the spread of fire and smoke through HVAC systems, thereby enhancing the overall safety of buildings.

The importance of adhering to this standard cannot be overstated, as it helps to protect the building's occupants and property by ensuring that the dampers function as intended during a fire event. This compliance is often mandated by local building codes to ensure that all installed dampers meet rigorous safety requirements.

While other UL standards relate to other types of products or applications, they do not specifically cover the essential features and requirements for dampers in the way that UL 555 does. This distinction underlines the crucial role that UL 555 plays in the safe operation of HVAC systems within structures.