Tapes and mastics used to seal ducts must comply with which standard?

The use of tapes and mastics for sealing ducts must comply with UL 181B standards. This standard specifically addresses the requirements for duct sealants, including tapes and mastics, ensuring that they are appropriate for use in heating, ventilation, and air conditioning (HVAC) systems. UL 181B includes testing criteria for properties such as adhesion, flexibility, and resistance to various environmental factors, which are essential for maintaining the integrity and efficiency of duct systems.

This is important as proper sealing of ducts not only affects air leakage rates but also impacts overall system efficiency, indoor air quality, and energy consumption. Compliance with UL 181B ensures that the materials used can withstand the conditions they will encounter, providing lasting performance in sealing applications.

While other standards like ASTM D 1002 and SMACNA may also be relevant in the broader context of HVAC and material specifications, UL 181B is specifically designed to govern the performance and safety of duct sealing materials. ASHRAE provides guidance on many aspects of HVAC design and operation but is not a standard governing duct sealant materials.