According to standards, how must duct joints be secured?

Duct joints must be secured in a way that ensures they are airtight to prevent air leaks, which can compromise system efficiency and indoor air quality. The correct approach is to seal these joints with materials like pressure-sensitive tapes that are specifically designed for duct systems. This sealing method provides flexibility while also allowing for easy maintenance or adjustments if needed.

Using pressure-sensitive tapes ensures that the joints are both secure and able to accommodate movement, which can occur due to thermal expansion or contraction of the ductwork. It is a common practice included in standards to enhance the overall performance of heating, ventilation, and air conditioning (HVAC) systems.

Other methods like screws alone or duct tape by itself may not provide the same level of sealing effectiveness. Welded joints, while secure, are not typically employed for ductwork because they can be more challenging to adjust or repair. Therefore, the method of sealing joints with pressure-sensitive tapes strikes the best balance between security and practicality in HVAC applications.