How do you reduce noise from HVAC systems?

HVAC systems are essential for maintaining a good indoor climate in homes and commercial buildings. They provide heating, ventilation, and air conditioning. However, these systems can produce quite a bit of noise, which can be perceived as disruptive or even burdensome in workplaces and living environments. Fortunately, effective solutions are available to address this noise problem.

Back to industry solutions

Why does an HVAC system make noise?

Sound in HVAC systems usually arises from airflows and vibrations of mechanical parts, such as fans. The air is forcefully blown through ducts and components, causing friction and turbulence. These movements of air can induce resonance and vibrations that spread through ducts and structural elements. Metal ducts, in particular, amplify the sound through the so-called cavity effect.

Additionally, motors and fans can also produce noise themselves. Mechanical vibrations from these components are transmitted through mounts and housings to the environment, making them audible in other rooms.

Reduce noise: start at the source

Those who want to reduce the noise of an HVAC system should consider tackling it as close to the source as possible. Depending on the construction and application of the system, you can take various measures. Often, the solution lies in damping air flows or insulating noise sources such as motor compartments and enclosures.

Dampening air guidance

The airflow through ducts or channels is a continuous source of noise. By lining the interior of these ducts with sound-absorbing material, you prevent sound from reflecting. This reduces the echo effect and noticeably lowers the noise level.

Note: It is important that the airflow is not obstructed. Therefore, choose a thin, absorbent material that does not affect the capacity of the system.

Properties of suitable material:

High sound absorption, even at low frequencies
Slim profile to maintain airflow
Fire retardant
Moisture- and mold-resistant
Flexible for installation in bends or tight spaces

An effective product for this application is, for example, EASYfoam FireSeal. This polyurethane foam is flexible, open-cell, and has a high specific weight, which ensures strong sound insulation. Additionally, the noise reduction of the air ducts themselves can be significantly improved by the

Mute sound of technical components

Mechanical components such as fans, compressors and pumps are often housed in a cabinet or enclosure. This technical casing is a logical place to apply acoustic measures, especially since there is often more space for damping material here.

Possible solutions:

Line the interior of the cabinet with sound-absorbing foam, such as EASYfoam FireSeal
Use vibration dampers or rubber mats, such as EASYbond or EASYmount vibration isolation, under machinery to reduce transmission through the structure
Construct an additional enclosure around noisy units, provided ventilation and heat dissipation are maintained

Always ensure that the materials are suitable for industrial applications: fire-resistant, durable, and resistant to moisture and dust. Don't forget to also consider service and maintenance access.

Need advice?

Want to be sure which solution is suitable for your HVAC system? Feel free to contact us for personal advice. We are happy to think along with you.

Related advice

Discover the world of acoustics

How do you reduce the noise in vehicles, rolling stock and heavy equipment?

Controlling noise production in vehicles is essential for comfort and appearance. The use of acoustic materials reduces noise, increases comfort for drivers and passengers, prevents fatigue during prolonged use, and contributes to a professional impression.