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Industrial Fan Silencers

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A wide variety of axial and centrifugal fans and single and multi-stage blowers are used in today’s industrial facilities in a multitude of applications. Rotating mechanical equipment such as fans are a common noise source in manufacturing plants. They may be stand alone or included as components in OEM equipment such as dust collectors and air handling units.

Fans, that are AMCA certified, will indicate “key” noise points on submittal data sheets and will include inlet, outlet and housing power and pressure noise levels.  Using this information, excessive noise levels are routinely and effectively attenuated with inlet and outlet silencers, housing blankets or wraps and encapsulating enclosures. 

The noise generated by fans can quickly become a significant problem, requiring the use of silencers and wraps. SysTech will work with you to address your specific fan/silencer needs and facility requirements including issues such as:

  • Space restrictions
  • Maintaining air flow by minimizing pressure loss through the silencer
  • Meeting environmental noise regulations and industrial health and safety requirements
  • Using construction materials specific to the application
  • Providing accessories including rain hoods, transitions, support brackets and flow measuring devices

Fan Inlet and Outlet Silencers

Fan Silencer Selection DataOur inlet and outlet silencers are designed to meet your exact noise attenuation requirement, with industrial silencer casings fabricated from heavy gauge steel or with lighter gages available for commercial duty silencers. Each silencer is designed and built for a specific pressure loss and airflow velocity.  Special construction, materials and paints are used when high temperature or corrosive gases are present in the airstream.  Options include rain hoods, 90-degree flow path (elbow silencer), screens and renewable packing designs. We can attenuate required fan inlet and outlet noise, but need more information. Click the PDF for required information.

Sound Blankets

When fan or blower housing noise exceeds permitted levels, consider a fan sound blanket wrap or rigid cladding for reducing breakout noise.  Noise attenuation, depending upon the fan noise spectrum, is up to 10 dBA @ 3 feet.  Blankets are sewn in sections and assembled with Velcro fasteners to totally encompass the fan/blower casing.  Typically they are 2 inch thick with a PVC vinyl sound barrier and fiberglass mat insulation.  Wrapping the fan housing only, in lieu of enclosing the complete fan assembly, negates the need to ventilate the motor and minimizes floor space requirements.

Noise Control Enclosures

Fans and blowers can be attenuated with double walled metal casing enclosures, entrapping and absorbing the unwanted noise. These “metal boxes” built of aluminum, galvanized or painted carbon steel, can be equipped with access doors, pipe and duct openings, and ventilation fans as necessary. They can be located indoors or outdoors and are designed to protect workers, allow easy access to the enclosed equipment for servicing and have minimal impact on the production process.

Identifying Fan System Noise

SysTech can help you solve fan system noise problems including:

  • Pulsing noise
  • Low rumble
  • High pitched squeal

After identifying the system noise, locate specific noise points including:

  • At fan inlet going back through the duct or hood
  • At fan outlet going into the surrounding environment
  • At drive shaft entry into fan housing
  • Drive motor
  • Fan housing
  • Bearing noise
  • Belt noise
  • Vibration of fan assembly
  • Excessive duct vibration
  • Excessive base vibration

SysTech offers a variety of fan silencing solutions and noise reduction methods for air moving systems.  Contact us to see how we can reduce your ventilation system sound to acceptable levels.

Industrial Fan Silencers

An Integral Part of an Industrial Ventilation System

Industrial ventilation fans and blowers incorporate silencers as a standard option, and their individual design is required for effective noise attenuation. Their integration into a ventilation system is a requirement for both process and ventilation air systems.

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