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What is UL 555-2020?

UL 555-2020 is a set of standards established by Underwriters Laboratories, an independent global safety science company, that specifically applies to the testing and certification of fire dampers. Fire dampers are crucial components in HVAC systems that help prevent the spread of smoke and fire during a building fire.

Importance of UL 555-2020 Standards

The UL 555-2020 standards play a vital role in ensuring the reliability and effectiveness of fire dampers. These standards provide guidelines for manufacturers to test their products against various mechanical, operational, and fire resistance criteria to ensure they meet specific ratings.

These standards also help building owners, architects, and engineers in selecting appropriate fire dampers for their projects. By adhering to the UL 555-2020 standards, they can be confident that the fire dampers installed in their buildings will perform as expected during a fire incident.

Key Requirements of UL 555-2020

The UL 555-2020 standards cover a wide range of requirements regarding fire damper construction, installation, labeling, and performance. Some of the key requirements include:

1. Construction: Fire dampers must be constructed from materials that can withstand high temperatures and provide adequate fire resistance.

2. Testing: Manufacturers need to subject their fire dampers to rigorous testing procedures to determine their performance in maintaining integrity during a fire event.

3. Installation: Fire dampers must be installed according to specific guidelines provided by UL 555-2020 to ensure their proper functioning.

4. Maintenance: Regular inspection and maintenance of fire dampers are necessary to ensure their ongoing efficiency. UL 555-2020 provides guidelines for these maintenance activities.


UL 555-2020 is an essential standard that promotes the safety and integrity of fire dampers. By adhering to these standards, manufacturers, building owners, architects, and engineers can ensure the reliability and effectiveness of fire dampers in protecting lives and property during a fire incident. Compliance with UL 555-2020 provides peace of mind and helps create safer buildings for everyone.

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TAGS Test Probe BTest Probe 18Test Probe 11Go GaugesIEC 61032IEC 60335Test PinTest FingerIEC 60061-3Wedge Probe7006-29L-47006-27D-37006-11-87006-51-27006-51A-2 7006-50-17006-27C-17006-28A-1Test Probe7006-27B-1IEC 61010IEC 60529IEC 60068-2-75