Hearing Protection at Factories

The most common problem and complaint from factory workers is excessive noise. There are typically large machinery and equipment with which they work with in addition to loud fans and vents in the area. Excessive noise does not just affect the worker’s professional life but hearing damage is permanent and affects their personal life as well.

There are a couple ways in which excessive noise can be reduced to a safe level for workers.

  1. Industrial Earplugs or noise cancelling headphones
  2. Quiet the noise source

Industrial Earplugs / Noise Cancelling Headphones

They are an acceptable method of reducing the noise exposure but are typically used temporarily to implement noise control solutions to the equipment producing the noise.

It is vital that the hearing protection fits properly and that they are worn at all times when being exposed to noise.

There are many options available but ultimately the choice is a personal one as long as it achieves the necessary NRR (noise reduction rating).

Noise Reduction at the Noise Source

Noise reduction at the noise source typically involves either adding a silencer to the equipment or creating an enclosure to absorb the noise and reduce the amount which reaches the workers in proximity.

The solution for noise reduction at the noise source greatly depends on the equipment/machine producing the noise, the application and the environment in which the noise source is located.

dB Noise Reduction is an expert in the design and supply of noise control equipment including silencers and noise enclosures. We would be more than happy to discuss your specific application to try and help attenuate the noise for the health and safety of your workers.

Acoustic Louvers

What is an acoustic louver?

An acoustic louver is a shallow fixed blade air noise attenuator (a short, wide silencer). It typically has angled horizontal blades which assist in weather resistance and also in changing the direction of sound waves.

Acoustic Louvers are used for moderate noise attenuation on low velocity / large area buildings, enclosures and plenum openings.

They are composed of an outer metal shell with a perforated profile facing the noise source. The inside of the metal shell is filled with acoustic media to absorb the sound energy once it passes through the blade of the louver. They are designed to reduce noise while minimizing the ingress of water.


Louvers are well suited for applications where space is limited and the use of standard silencers is impractical.  They are able to fit in small areas due to their lack of depth but tend to be rather large in surface area. Acoustic Louvers are commonly used for building, enclosure, and room ventilation and HVAC systems.


Acoustic Louvers may come equipped with mounting flanges for surface mounting, galvanised and stainless steel mesh for bird, insect and safety screens or even chevron designs for greater noise attenuation.

dB Noise Reduction® offers a number of noise control solutions including acoustic louvers. For product details please visit our webpage on acoustic louvers or contact us through email at sales@dbnoisereduction.com or call us using our toll free number 877-774-8601.


Earth Day – A Spotlight on Noise Pollution

Earth day is a day dedicated to remembering the importance of keeping our planet healthy and clean.  In commemoration of this day we typically make promises to help the environment or make a positive change in our community. Commonly, these promises involve increasing recycling, reducing waste, properly disposing of e-waste, swapping to energy efficient light bulbs, planting a tree, and/or being conscious about energy consumption. These are all very important goals to commit to but other – more challenging- objectives have gained additional attention.

Noise pollution takes place when there is excessive noise or unpleasant sounds that may harm human, animal, or plant life. The main sources of outdoor noise are machines, equipment and transportation systems such as trains, motor vehicles and aircraft. As civilization expands into what used to be forests and as cities are more and more populated it’s becoming harder to maintain noise levels at an acceptable level.

You might think, how much can high noise levels really affect us? Excessive noise not only causes psychological problems but it also affects our physical well-being and can over time make us sick. [See: What Runs the World? STRESS] For example, the noise produced from a chain saw can cause permanent hearing damage in just one hour, while the sound of a jackhammer causes IMMEDIATE physical damage. This is why hearing protection is essential when exposed to noisy equipment and precautions need to be taken to control noise sources from producing excessive noise.

Can plant life also be affected by high noise levels? Absolutely! Birds will flock from those areas with high noise levels preventing pollination from occurring and limiting the spread of seeds. The effect cascades into the entire ecosystem changing our planet’s natural balance.

It is extremely important to protect our planet from excessive noise. dB Noise Reduction has committed to the goal of reducing noise pollution in our planet through the use our extensive line of noise reduction products and our Nois-eNvelope line of Architectural Environmental Noise Barrier and Noise Enclosure systems. Through the use of these products we can tackle an aspect of pollution that is often dismissed or deemed unimportant.

www.dbnoisereduction.com | www.noisenvelope.com

Acoustics, more than what meets the ear

What is the study of acoustic?
When the word “Acoustics” gets thrown around it is often perceived as concerning purely musical acoustics. Few associate the word with the physics involved regarding sound, in buildings or in an open environment, generated from everyday activities.  The Merriam-Webster definition of Acoustics is the science that deals with the production, control, transmission, reception, and reflects of sound.

Don’t assume when someone tells you they work in acoustics that they have a career in music, there are many fields within acoustics…some may even be of interest to you!

Acoustical Engineering
Acoustical Engineering is a branch of engineering which deals with sound and vibration. Typically acoustical engineers are concerned with noise control.

A career in Acoustical Engineering generally involves extensive knowledge in physics and mathematics and usually requires a bachelor’s degree in an engineering discipline.

Architectural Acoustics
Architectural Acoustics is a branch of Acoustic Engineering which focuses on achieving superior sound within a building, whether it’s through the enhancement of sound or the suppression of noise. An increased awareness of the importance of acoustical design is causing an expansion from its use in concert halls and recording studios into offices, factories, and learning and medical institutions.

Typically acoustic consultants help manage sound within an enclosed environment. A career in this field generally requires a degree in acoustics or physics. In addition, it is important to have knowledge of the environmental legislation and standards depending on the location.

Psychological and Physiological Acoustics
Psychoacoustics is the study of sound perception, the psychological and physiological responses associated with sound. This field strives to explain how we respond to sounds, such as music, and noise, such as construction noise. This helps designers select the appropriate sounds to achieve the feeling they desire in the space. This study of sound perception is exploited in film and music as it helps set the psychological response from the audience.

A career in psychoacoustics typically demands a degree with exposure to acoustics or psychoacoustics.

Underwater Acoustics
Underwater Acoustics is the study of the behaviour of sound in water. A common application of underwater acoustics is through the use of acoustic signals (systems) to guide underwater vessels, a valuable tool for both military and commercial use.

A career in Underwater Acoustics typically requires at least a degree in engineering or similar discipline. Experience in acoustic and software engineering would be an advantage when entering this field.

Noise Control
Noise Control is a field of Acoustical Engineering in which the objective is to suppress noise whether it is to meet environmental regulations or improve quality of life. Noise pollution is an increasing concern that has motivated the development of strategies for its reduction usually through the addition of a silencer or an enclosure encompassing the noise source.

A career in Noise Control involves a deep understanding of the behaviour of sound and the determination of solutions to environmental noise problems which requires considerable knowledge in acoustics.

Physical Acoustics
Physical Acoustics is a field of Acoustical Engineering which studies the way in which sound waves propagate in different mediums including solids, liquids, gases, and plasmas.

A career in Physical Acoustics generally revolves around research and typically requires an advanced degree in physics.

Structural Acoustics and Vibration
Structural Acoustics and Vibration is a branch of engineering of great concern to engineers. The main focus is that machines and structures need to be designed to withstand vibration as components can be damaged or structures can collapse under excessive vibration. Furthermore, excessive vibration can also be quite noisy.

In this field engineers have the task of either eliminating the possibility of vibration or isolating the vibrating equipment. A career in this field requires exceptional mathematical skills and ingenuity to arrive at useful insights that can be used in real world situations.

Musical Acoustics
Musical Acoustics is typically the field that comes to mind when thinking of acoustics. This field deals with the way in which musical sound is perceived and produced through the use of instruments, human voice, and computer generated sounds. A common application involves the use of sound for therapy to improve physical and mental health.

Those who work in the field of Musical Acoustics typically have an interest in both music and science and frequently have worked in the entertainment, education, or musical instrument industry.

Biomedical Acoustics
Biomedical Acoustics is the study of the interaction of ultrasound energy with biological tissues. This field has incredible applications in the diagnosis and treatment of diseased tissue.

A career in biomedical acoustics requires not only an interest in biology and medical science but also acoustics and physics.

A Career in Acoustics
There are many fields within Engineering Acoustics other than the ones outlined above, which simply scrape the surface of the field. Companies like, dB Noise Reduction, focus on the branches of engineering acoustics including Architectural, Noise Control and Vibration. Originally dBNR focused on the Industrial noise control industry but are rapidly expanding into the architectural field as well. Thanks to their experienced team of acoustical engineers they have developed into a strong company in the industry with acoustic designs to meet a variety of applications. From Industrial Silencers to Architectural Acoustics, dBNR is a leader in Acoustic Engineering.

dB Noise Reduction is continuously looking for new talent to join our innovative and hard working team. Whether you have a nick for sales development or have a passion for engineering design and solutions, dBNR offers excellent working conditions and encourages personal development.  Check our  Careers page often for our available positions ranging from full-time to co-op student positions.


The following article was written by Richard Anthony, Director, dB Noise Reduction

One of my sisters is a health and wellness expert. She has stated for years that, “Sitting is the new smoking”.  Our Mother had died of lung cancer, so she was not trivializing smoking but instead pointing out that sitting TOO MUCH  has a profoundly negative effect on human health.

Since learning about the adverse effects of noise on human health, I have modified this phrase to make the point: “NOISE is the new smoking”

If you haven’t yet heard about them, please let me introduce a great organization to you: the good people at the Hearing Health Foundation.   (www.hearinghealthfoundation.org).  They want to remind us that October is also “NATIONAL PROTECT YOUR HEARING MONTH”.

These people perform a great service in publishing facts about noise and awareness about Tinnitus and the most damaging type of hearing loss:  Noise Induced Hearing Loss (NIHL).  They also inform us about new technologies and advancements in physics and medical research that point the way to one day being able to repair hearing damage – until then, NIHL remains irreversible BUT PREVENTABLE. 

For a perspective on the scale of today’s noise problem,  Hearing Loss (NIHL and Tinnitus) affects up 50 million people; 20% of teenagers (think: earbuds/headphones) and 60% of active military and veterans.  These statistics are for the USA only!   Adverse health effects from Hearing Loss are not limited to deafness – it can also contribute to cardiovascular and other physical and/or mental health conditions.

The prerequisite of prevention is AWARENESS.  When exposed to loud noise, The Hearing Health Foundation advises to Walk (literally, walk away – noise dissipates with distance), Block (use ear plugs and/or ear muffs; use noise barriers, or even put your hands over your ears in an urgent situation), Turn (turn down the volume; throttle-back machinery; adjust the direction of the noise source).  

 Please protect your hearing – for life.

 About dBNR:  dB Noise Reduction provides custom noise control, acoustic and vibration isolation solutions for any application.  Contact sales@dbnoisereduction.com for assistance.

Extreme Silencer Applications

Silencers, Mufflers, Attenuators, Splitters, Baffles, Sound Traps – they are all similar but slightly different.

In general, these noise reduction devices are designed to reduce noise (unwanted sound) from within an air intake system or exhaust system (which could be exhausting air or a gas other than air).   Any such device that invades the airstream will invoke a pressure drop on the system, as it obstructs flow.

It is for this reason that these noise control devices require proper engineering to balance the required noise reduction against the allowable pressure drop within the system.  More extreme and critical applications, such as gas turbines, high temperatures/velocities/mass flow; airstream particulate and such require commensurately appropriate extreme engineering and manufacturing capabilities.

Such is also the case with vent and blowdown silencers*.  These particular noise reduction devices are inherently pressure vessels, and must be precisely designed and manufactured to withstand extreme conditions.  The attention to detail and quality for critical internal components cannot be overlooked, since safety must always be the primary consideration when designing for these extreme conditions.

While specializing in extreme noise control engineering and systems, dB Noise Reduction is your source for all environmental, industrial, architectural and vibration isolation noise control systems.  dB Noise Reduction even has acoustic barrier and noise control enclosure panels up to 24’ long in a single span – the longest in the industry; offering superior labor savings and a monolithic appearance.

Please visit our website, or contact sales@dbnoisereduction.com for assistance with selecting the appropriate silencer or noise control system for your application.

Richard Anthony

*Source:  “A Practical Guide to the Specification and Selection of Vent and Blowdown Silencers” John E. Praskey, dB Noise Reduction, presented at INCE Inter.Noise 2015

WHY you really do need a professional Acoustical Consultant

A professional acoustical consultant can correctly analyze and solve noise problems – and avoid costly errors.  Sound often does not behave the way the math, science and common sense suggest it should.  These professionals understand the whole situation and how sound behaves; as well as the complex interactions that occur between different noise sources and conditions on site.  Their precise knowledge, along with relevant experience ensures that an appropriate solution is determined for the project.  They will generate either a product or performance-based specification.  Typically, several manufacturers will bid and are required to meet or exceed that specification.  Experienced acoustical consultants understand the importance of a good manufacturer with a solid, reliable reputation for providing quality products and solutions.  They expect to see (and hear/not hear) successful results.

In many jurisdictions, it is not only mandatory to engage the services of a professional acoustical consultant, but often another separate acoustical consultant must provide verified results post-installation.

Choose a professional acoustical consultant – because it just has to be done right.

NOTE:  dBNR is NOT an acoustical consulting firm; dBNR is the designer and manufacturer of products and systems specified by independent acoustical consultants.  dBNR recommends retaining the services of a professional acoustical consultant for direction in solving your noise problems on site.   


Thank you to our Richard Anthony for writing this article.

“Silencer Selection Web App”, a new addition to the dB Noise Reduction website

We have added a new tool to our website that provides our customers with the ability to easily select the correct silencer for their noise control requirements. The silencer selection tool was designed to provide customers with a quick and easy process that will facilitate their silencer selection.

This new selection program allows customers to obtain a quote on the most cost effective and efficient silencer that will meet their requirements with a simple input screen. The App requires some basic information about the intended silencer, such as orientation, connection, target noise level, etc…This will provide the customer with a listing of silencer options and detailed information, including pricing, regarding each alternative. Once the ideal silencer has been selected, customers can contact the dB Noise Reduction sales team directly from the silencer selection tool page.

The silencer selection tool is currently available for circular and rectangular silencers and is the first of many software sets. “This project is an ongoing development process that will eventually include all of our products.” said President of dB Noise Reduction, John Praskey. The goal is to provide the best service to customers by providing a fast and simple tool to order quality products. The next undertaking will be the addition of vent silencers to the new tool.

To access the dB Noise Reductions Web Apps, please visit www.dbnoisereduction.com and click on the “Web App” button on the navigation bar or follow the link: www.dbnoisereduction.com/web-app.php.

The dB Noise Reduction team announces the addition of two new members.

dB Noise Reduction is proud to announce the addition of two new members: Richard Anthony and Mehrzad Salkhordeh. Each possessing almost two decades of experience in the Noise Control Industry, both are well known and make a great addition to the team. Together, Richard and Mehrzad are expected to increase dBNR’s market reach and further increase the sales of the company.

Richard Anthony is the new Director of business development at dB Noise Reduction. Located at the sales office in Columbus, OH, his focus in this position is on marketing, technical sales and developing key accounts. He is the ideal candidate as he is equipped with over two decades of experience in international sales and operations in an executive capacity and has been in the acoustics and noise control field for eighteen years.

Mehrzad Salkhordeh is joining the team also as Director of business development at dB Noise Reduction. With 16 years of experience in the acoustics and Noise Control Industry he will be joining the Cambridge, ON sales office. With strengths in manufacturing and technical sales, engineering and operations, Mehrzad is an agile thinker with a tactical approach to solutions.

Richard can be reached at 519-651-3330 ext 236, ranthony@dbnoisereduction.com. Mehrzad can be reached at 519-651-3330 ext 220, mehrzad@dbnoisereduction.com.

Welcome to dB Noise Reduction, Richard and Mehrzad.

Stopping the Noise Pollution of Self-Cleaning Filter Systems

While self-cleaning filter systems are great for avoiding clogs and pressure loss in filtration systems, these pneumatic pulse cleaning systems can cause another problem – noise pollution. A recent example of this is the case of a foundry operation located within 100 feet of a residential area. Noise from a sixteen cartridge dust collector was causing a neighborhood disturbance during night time operation. The noise problem was exacerbated by the pneumatic pulsing of the filter cleaning cycle.

In this situation, the noise level produced by the fan discharge was 96 dBA and 101 dBA. An industrial grade fan silencer and acoustic flexible connections developed by dB Noise Reduction provided effective noise suppression. To address the noise caused by the pulsing cleaning of the filter media in the collector, which was 70 dBA noise level reading at the property line, dB Noise Reduction installed silencers on the bleed solenoids and diaphragm valves, as well as an acoustic lining on the clean air plenum. Following installation of all of the new noise abatement equipment, the overall noise level was reduced by 31 dBA, with a 44 dBA level at the property line, during night time pulse cleaning.

The dB Noise Reduction team has extensive field experience in the analysis of noise control issues and the development of affordable and feasible solutions. We custom develop applications to seamlessly fit specific needs and goals. From acoustical evaluations to assess noise issues, to the manufacture of quality components, to the complete installation of all equipment, our specialists see projects through every step to completion.

In addition to providing effective solutions to address noise control requirements and regulations, we focus on completing projects quickly, while maximizing economy and efficiency. Our clients rely on us for dependable solutions and quality products that meet both their needs and budget. Contact us to discuss your noise control needs.