Duct smoke detectors must comply with which standard?

Duct smoke detectors specifically need to comply with UL 268A, which is the standard for "Smoke Detectors for Duct Applications." This standard addresses the unique requirements of smoke detectors that are designed to be installed in the ductwork of HVAC systems. These detectors are essential for detecting smoke within the air handling systems of buildings, ensuring that smoke is identified and mitigated before it circulates through the air ducts.

In contrast, UL 268 pertains generally to smoke detectors but does not specifically address the operational conditions found in ducted applications, such as airflow and temperature variations. NFPA 72 is the National Fire Alarm and Signaling Code, which provides guidelines on fire alarm systems but does not specifically set the performance standards for the detectors themselves. ASTM E 84 is a standard test for surface burning characteristics of building materials and is unrelated to smoke detectors.

Understanding the specific standards for duct smoke detectors is critical for ensuring compliance with fire safety regulations and achieving effective smoke detection in HVAC systems.