Noise Reduction Techniques For Industrial Draught Fans
                     NOISE REDUCTION TECHNIQUES FOR 
INDUSTRIAL DRAUGHT FANS
Neel Rao
Writes on Reitzindia massive industrial fans,  ID fans and 
induced draft fans from Reitz india.
Industrial draught fans have crucial applications in numerous manufacturing 
processes. However, they have a significant drawback in the form of the noise they 
generate during operation. This excess noise not only disturbs the working 
environment in industries but also causes adverse impacts and hampers the 
efficiency and performance of the equipment. Thus, mitigating these issues ensures 
a worker-friendly, peaceful environment but also increases operational and energy 
efficiency. For all these reasons, implementing effective noise reduction techniques 
is important.
Understanding Noise Sources
Before we understand how to reduce noise from industrial draught fans, it is crucial 
to understand the primary reasons or sources from which the noise emanates. Let’s 
first understand the typical mechanisms that generate noise in industrial process 
fans.
1) Structural Causes: Structural noise emerges from vibrations emanating from the 
fan that amplifies the overall level of noise with transmission to the surrounding 
structures.
2) Mechanical Causes: When vibrations are caused by the rotating parts of the fan 
like the motor or fan shaft, it leads to mechanical noise.
3) Aerodynamic Reasons: Noise generated from the interaction of air with the fan 
blades and other components while moving through the fan causes aerodynamic 
noise.
Noise Reduction Techniques
There are various techniques and ways to reduce the generation and transmission of 
this noise and effectively address their sources. Let’s put a lens over some of the 
strategies.
A. Selection And Design Optimisation
1) Using Low-Noise Fans: Choosing fans that have been customized to operate while 
producing lower levels of noise and greatly reducing noise issues.
 
2) Blade Design Optimisation: The aerodynamic noise of fans can be drastically 
lessened by improving the design of fan blades. This can minimize turbulence and 
address the noise issue.
 
Review of technical specifications: To ensure compatibility with power needs and 
environmental conditions, review the technical requirements of the fan 
manufacturer.
B. Acoustic Barriers
1) Fan Enclosures: In certain circumstances, noise emissions from draught fans can 
be effectively contained and reduced with the installation of acoustic enclosures or 
customizing houses around the fans.
2)Absorption Material Barriers: Employing noise adsorbing materials or placing 
noise barriers around the fans can attenuate noise levels further from reaching the 
surroundings.
C. Isolating Vibration
1) solation Mounts: Noise caused due to structural reasons can be reduced by using 
vibration isolation mounts. These components mounting the fan can prevent 
vibrations from transmission to surrounding structures.
2) Flexible Connections: Another great way to reduce noise transmission from 
industrial draught fans is by using flexible connectors in piping and ductwork linked 
to the fan which helps isolate vibrations.
D. Operational Noise Control
Optimizing Operational Conditions: Operational parameters like airflow and pressure 
play a big role in fan efficiency. Optimizing these parameters can reduce noise 
generated by fans.
Speed Control: Controlling the speeds of the fan to lower operation by implementing 
variable frequency drives generates low noise emissions.
Monitoring and Maintenance
1) Scheduled Inspection: Regular check-ups and maintenance of draught fans can 
identify any potential sources of noise transmission for early resolution before 
their escalation.
 
2) Lubrication: Proper and timely lubrication of fan bearings and other moving 
components not only reduces early wear and tear can or increases efficiency by 
minimizing friction and noise generated from it.
Conclusion
Reducing noise from industrial draught fans enhances operational efficiency and 
creates a more comfortable environment apart from ensuring compliance with noise 
regulations. Meticulously employing a combination of measures from fan selection 
to design optimization, vibration isolation, and effective maintenance practices can 
aid industries in efficiently mitigating noise issues associated with draught fans. This 
benefits the workforce, and work environment and enhances overall operational 
productivity and longevity of equipment in industries.
About REITZINDIA
Reitz India has set a benchmark to deliver high quality fans for heavy duty industries 
which can work at precise operating conditions like high temperatures and 
pressures. Reitz offer idealistic Centrifugal Fan and Centrifugal blower design that 
can be used in all large scale process industries like cement, iron & steel, power 
plants, fertilizers/ chemicals and more.
Thank you for spending your precious time in reading this article!