What marking is assigned for pressure-sensitive tape used in ductwork according to UL 181A?

Pressure-sensitive tape used in ductwork is marked with the designation 181A-P according to UL 181A. This classification indicates that the tape meets specific performance criteria for use in air duct systems. The "P" designation signifies that the tape is intended for use with flexible duct and is designed to provide a reliable seal in a range of temperatures and conditions.

UL 181A outlines various testing and performance standards to ensure that the tape can withstand the pressures and environmental factors that duct systems encounter. The markings assist in identifying the suitability of adhesive products for specific applications, ensuring compliance with safety and efficiency standards in HVAC installations.

Understanding the markings and their meanings helps professionals select the appropriate materials for their projects, thus enhancing the overall performance and reliability of the ductwork systems.