How is insulation commonly attached to the inside of a metal air duct?

Insulation is commonly attached to the inside of a metal air duct using tabs and glue because this method provides a secure bond while allowing for flexibility and a clean installation. The tabs often have an adhesive backing, making it easy to press and hold the insulation in place during and after installation. This approach helps ensure there are no gaps or thermal bridges that could cause efficiency losses.

Using tabs and glue is advantageous because it minimizes the risk of damage to the insulation material, ensuring it remains intact and effective over time. Additionally, this method can reduce noise transmission within the ductwork, contributing to a quieter HVAC system.

Other methods, such as using screws and washers, metal clips and adhesives, or stapling, may not provide the same level of effectiveness or ease of use. Screws can create potential points for thermal bridging, while metal clips might not hold insulation as securely. Stapling can lead to material damage if not performed carefully and may not provide the same adhesion and sealing properties as tabs and glue.