What is the source of the auditory disturbance?

What is the source of the auditory disturbance?

Heating, Ventilation, and Air Conditioning (HVAC) systems constitute an indispensable facet of any architectural structure, spanning from modest residential abodes to sprawling corporate complexes and industrial behemoths. Notably, these systems, while essential, frequently engender undesirable noise emissions, manifesting through two distinct avenues.

The primary source of noise in HVAC systems emanates from the dynamic airflow within the system. This sonic intrusion is a byproduct of the substantial air volume generated by fans or blowers, tasked with propelling air throughout the system. Furthermore, noise is also induced by the turbulent airflow’s cacophonous collision with bends and corners within the ducting infrastructure.

The second form of noise perturbation arises from mechanical vibrations. Over time, the fasteners and supports that secure the ductwork may loosen, permitting uncontrolled swaying and vibration. Additionally, ductwork fabricated from sheet metal may experience deformation or bending, resulting in flexion and heightened resonance as airflow intensifies. It is important to note that fluctuations in temperature can exacerbate this phenomenon, as metal expands or contracts, intensifying the acoustic disturbances.

The Remediation Approach

Initial reactions to HVAC noise disruptions often evoke concerns about system malfunctions necessitating costly repairs. Fortunately, the genesis of most duct noise issues is typically not a cause for alarm.

To effectively insulate HVAC systems from unwelcome noise pollution, it is imperative to address both the aforementioned sources of disturbance. Compliance with industry standards, such as ASTM E84 Standard Test Method for Surface Burning Characteristics of Building Materials, is also imperative.

Addressing these twin challenges while adhering to building fire codes can be achieved through a selection of available products designed for this purpose. Mass Loaded Vinyl (MLV) and duct wrap are among the favored choices. It is worth noting that a proactive approach, wherein duct liners are incorporated during HVAC system installation, can significantly diminish airborne noise pollution.

An alternative solution involves employing a MLV product boasting a foil-facing and a quilted fiberglass decoupler. This innovative configuration effectively attenuates sound waves at the source by initially absorbing them through the fiberglass component and subsequently impeding their propagation via the mass-loaded vinyl. Any residual sound wave reflection is further dissipated within the fiberglass absorber.

Mass Loaded Vinyl offers an effective resolution to a plethora of challenging noise-related issues, with HVAC noise abatement being just one of its multifaceted applications.

For comprehensive insights into mitigating HVAC noise pollution or further inquiries, please do not hesitate to contact us at We are unwaveringly committed to providing expert guidance and assistance in this domain.