Sun. Jun 26th, 2022
HVAC noise

HVAC noise reduction is an increasing requirement in both commercial and industrial buildings. Several approaches may be taken, but only a few of them are genuinely beneficial.

According to the Occupational Health and Safety Administration (OHSA), noise pollution is harmful to employees’ health. It not only interferes with focus and productivity, but it can also cause health problems.

Fortunately, you have various options for resolving this problem. The strategies mentioned below can successfully minimise noise, but one option, in particular, can address the problem regardless of the degree of hearing impairment.

Techniques For Reducing HVAC Noise

You may accomplish success in HVAC soundproofing by employing one of the following methods:

  1. Make Use Of Soundproofing Blankets And Barrier Walls:

If you want the most effective option for reducing noise pollution, a constructed sound barrier wall is the way to go. These specialised walls not only assist in reducing noise from HVAC systems, but they may also block noise from highways, railways, and other sources of noise pollution.

These walls are divided into two types: 

  • Those that reflect sound 
  • Those that absorb it. 

You can control undesired sound from the HVAC fan, compressor, and other mechanical equipment regardless of the kind you pick.

  1. Replace Or Upgrade Your HVAC System:

Air conditioning and heating systems are becoming more energy-efficient and silent. If your HVAC system was installed in the 1990s, replacing it with a modern type is preferable. Select a more current HVAC model that has VRF technology. These systems adapt to the environment to minimise disruptive on-off cycling. Instead, they operate at a lesser capacity, resulting in a quieter operation. You also need to clean them as frequently as possible. You may consult for dryer vent cleaning in Atlanta. It is a qualified agency. Contact them now to experience hassle-free cleaning!

  1. Avoid Using Noisy Ducts:

Walls may muffle the sound of HVAC systems, but sound can still travel via vents and ducts.

As a result, workspaces near the vents are noisy. You have two alternatives for dealing with this problem: either relocate the work areas away from the loud ducts and vents or talk with a specialist to see whether the airways can be repositioned.

When noise from outdoor equipment annoys other people, use barriers near your HVAC ducts. In most cases, barriers provide less than 15 decibels of sound attenuation in the middle frequency band. The noise barriers must at least impede the direct line of sight between the source and receiver to be effective.

  1. Cover HVAC Ducts:

If relocating the ducts and airways is not an option, have your HVAC specialists wrap the ducts to reduce noise. It is an efficient HVAC sound dampening technology that reduces the noise produced by the air passing through the ductwork.

You need to Vibration-isolate your ducts and pipes for at least the first 50 feet away from vibration-isolated equipment. You can use spring and neoprene hangers for this purpose. 

Covering HVAC ducts can significantly minimise the risk of trashy ducts. However, in other cases, you need to clean them. You can contact a specialist for air duct cleaning in Atlanta. Their cleaners and technicians are very co-operative and professional. 

  1. Rearrange The Furniture:

Modern business facilities with high ceilings and a plethora of smooth surfaces composed of glass and metal look great. However, all of these might cause an echo effect, magnifying the sound originating from the HVAC system. 

Add interior plants, rugs, and decorative wall coverings to counteract the echo. You will not only assist in reducing noise, but you will also improve the well-being of your staff.

Moreover, Create duct connections at the fan’s intake and exhaust to ensure consistent and direct airflow. Turbulence (at the fan’s intake and outflow) and flow separation at the fan blades may both considerably enhance fan noise. Turning vanes near fan outputs can also enhance turbulence and noise, especially if the airflow is insufficient. Moreover, We also need to install Grilles, diffusers, and registers as far away as possible from elbows. Branch take offs are practicable.

Eight Ways To Control Vibration In Your HVAC System:

According to the 2007 ASHRAE Handbook–HVAC Applications, engineers should consider the following when selecting fans, pumps, and other associated mechanical equipment and when designing air-distribution systems to reduce noises transferred from system components to inhabited spaces:

  1. Create the air-distribution system to minimise flow resistance and turbulence. High flow resistance raises the needed fan pressure. Thus, resulting in increased noise, particularly at low frequencies. Turbulence also amplifies flow noise produced by duct fittings and dampers, particularly at low frequencies.
  2. When managing the needed airflow and static pressure, choose a fan that operates as close to its rated peak efficiency as feasible. Also, choose a fan that produces the least noise under the specified design parameters. Using an oversized or undersized fan that does not run at or near its specified peak efficiency can significantly increase noise levels.
  3. Choose duct silencers that do not considerably raise the needed total static pressure of the fan. You need to Select silencers with static-pressure losses of 0.35 in. of water or less. It can help to reduce noise caused by silencer airflow.
  4. Keep fan-powered mixing boxes and variable-volume air-distribution devices away from noisy locations.
  5. It is preferable to utilise flow straighteners or honeycomb grids, often known as “egg crates,” in the necks of short-length takeoffs that go directly to grilles, registers, and diffusers rather than volume extractors that protrude into the main duct airflow.
  6. Duct transitions should not be more than a 15 degree including expansion angle. Otherwise the subsequent flow separation may induce rumbling noise.
  7. Always install Turning vanes in large 90-degree rectangular elbows and branch takeoffs. It results in a smoother directional shift, which reduces turbulence.
  8. In acoustically sensitive areas, utilise volume dampers sparingly near grilles, diffusers, and registers.

Final words:

In conclusion, we can say that it’s beneficial to have a noise-free HVAC system. It is more eco-friendly and comfortable. 

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