How are duct connections typically sealed in HVAC systems?

In HVAC systems, duct connections must be securely sealed to prevent air leaks that can compromise system efficiency and performance. Pressure-sensitive tape or mastic is specifically designed for this purpose.

Pressure-sensitive tape is strong and adheres well to a variety of materials commonly used in ductwork, providing a reliable seal. Mastic, a thick adhesive compound, is particularly useful for sealing joints and seams, as it can fill gaps effectively and maintains a durable bond over time. Using these methods ensures that the ductwork maintains proper airflow and minimizes energy loss, contributing to the overall effectiveness of the HVAC system.

In contrast, methods like using plastic wrap or overlapping duct sections do not provide the same level of air-tightness and can lead to significant energy inefficiencies. Unlisted duct tape, while sometimes used in less regulated situations, does not meet the stringent requirements for sealing that pressure-sensitive tape and mastic fulfill, making them the preferred choices for professional installations.