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Industrial fan inlet silencers are part of an intake fan system and are designed to attenuate noise developed from the fan inlet. Air filters, inlet boxes, screens, and dampers may be included as part of the complete package. The silencer may be mounted on the fan or blower inlet or a supply air duct or along a wall. Intake silencers may be tubular shaped and identified as a circular or round silencer or rectangular as determined by the inlet flange geometry. Low-pressure loss through the silencer, with expected attenuation, is the design goal and essential to keep the fan horsepower requirement as low as possible. Final silencer selection is determined based on airflow and fan sound levels, along with airstream/environmental air constituents a critical consideration.

Inlet fan silencers are manufactured in many configurations and materials to meet attenuation requirements. Collected data along with space envelope and required noise levels need to be firmly established before the silencer is successfully designed for an application.

Fan Inlet Silencer Construction Options


Inlet silencers are designed and constructed to meet the exhaust system pressures and performance requirements. Many construction options are available and include:

  • Metal gauges to 3/8” steel plate
  • Carbon steel, stainless steels, or FRP
  • Flanges
  • Supports
  • Screens
  • Paints & coatings
  • Removable baffles
  • Horizontal or vertical configurations
  • Inlet elbows
  • Weather hoods

Intake Fan System Silencer Accessories


Every intake fan silencer design varies with the air system application and physical constraints.  Systems often include:

  • Weather hoods
  • Filter housings
  • Transitions & evases
  • Airflow probes
  • Access doors

Intake Fan System
An Integral Part of an Industrial Ventilation System


Integrated industrial ventilation systems, where industrial exhauster or blower noise is a contributor to overall plant noise or impacts adjoining communities, typically incorporate an intake silencer system on the fan or blower inlet.  Modifications to both axial and centrifugal fan designs to meet these application requirements and noise criteria are typical design configurations offered by SysTech.

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