Technical Articles

What is UL 674 ?

Title: What is UL 674 and UL 676: A Comprehensive Guide to Technical Standards

UL (Underwriters Laboratories) is a global organization that provides safety and performance standards for a wide range of products. UL 674 and UL 676 are two of the most important technical standards that manufacturers and end-users must comply with to ensure the safety and reliability of various types of equipment. In this article, we will provide a comprehensive guide to UL 674 and UL 676, including their purpose, requirements for compliance, and how they can give consumers confidence in the safety and performance of equipment.

Understanding UL 674: An to the Technical Standard

UL 674 is a technical standard that specifies the requirements for certain types of industrial equipment, particularly related to heating, ventilation, air conditioning, and refrigeration (HVACR) systems. The purpose of UL 674 is to evaluate whether such equipment meets the necessary safety standards to prevent potential hazards and ensure reliable operation.

UL 674 Compliance: The Key Requirements and Testing Procedures

To achieve UL 674 compliance, manufacturers must comply with the requirements outlined in the standard. These requirements include safety requirements, performance requirements, and environmental requirements. Compliance with UL 674 not only safeguards the users but also helps manufacturers build trust and confidence in their products.

What is UL 676?

UL 676 is a technical standard that defines the requirements for electric air heaters. These heaters are widely used in various industrial and commercial applications to provide controlled heating solutions. The purpose of UL 676 is to ensure the safety and performance of electric air heaters.

Key Requirements of UL 676

UL 676 compliance is critical for manufacturers to ensure the safety and performance of their electric air heaters. The key requirements of UL 676 include electrical requirements, thermal requirements, and performance requirements. These requirements are designed to reduce the risk of electrical shock, fire, and thermal injury.


UL 674 and UL 676 are important technical standards that help ensure the safety and reliability of certain types of equipment. Compliance with these standards is mandatory for manufacturers to ensure that their products meet recognized safety standards. By understanding the requirements of UL 674 and UL 676, manufacturers can build trust and confidence in their products, while also protecting the safety and well-being of their users.


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