HVAC Sheet Metal Block 1 Practice Exam

The main purpose of duct liner is to reduce noise caused by air movement. Duct noise can be a significant issue in HVAC systems, as the movement of air through the ducts can create a range of sounds that may be disruptive in residential or commercial spaces. By using duct liner, which is a sound-absorbing material typically adhered to the interior surfaces of the ductwork, the transmission of sound can be minimized. This helps create a quieter environment by absorbing the noise generated from air traveling through the system, making it particularly useful in applications where comfort and noise levels are a concern.

While preventing condensation and preventing ductwork from drumming are valuable features that may relate to duct system performance, they are not the primary role of duct liner. Similarly, airflow efficiency is influenced by many factors, including duct design and size, rather than just the presence of a liner. The primary intention behind duct liner is primarily aligned with noise reduction.