Other Methods for Noise Control
“Controlling Noise Using Proven Engineering Designs”
FRP silencer on outlet of a FRP exhaust fan
Fan Silencers
The intake and discharge fan silencers are an important part of the ventilation, air movement, or air pollution control system. Fan silencers are an essential noise control accessory because of industrial facilities’ number of centrifugal and axial fans. Each fan silencer is designed by measuring the current fan noise level at various frequencies and determining the sound reduction necessary to meet the noise level requirements. These factors determine the overall length of the silencer required to complete the specified sound reduction. The silencer casing is usually fabricated from heavy gauge steel, but lighter gauge designs are also available for commercial applications.
Silencers can be mounted on the fan inlet or outlet, along a wall, or in an air supply duct. They are designed to properly attenuate the noise while minimizing pressure loss in the ventilation system.
Depending on client requirements, the silencer design may include optional metal gauges for carbon steel, stainless steel, or FRP construction, screens, vertical or horizontal configuration, removable baffles, and weather hoods.
Cooling fans with inlet silencers
Fan housing wrap for attenuation of fan housing noise
Noise Wraps
Noise wraps are quilted blankets that are form-fitting to the fan, reducing noise by up to 10 decibels. They minimize breakout noise from ductwork, fan housing, and dust collectors.
Standard noise wraps are made from fiberglass matt and PVC vinyl sound barrier with Velcro attachment. As a standard, the blankets have a thickness of 2″.
Acoustic Flex Connectors
The inlet/outlet acoustic flexible connectors connect the fan or blower to a silencer or duct to a silencer or industrial air handler.
Conventional HVAC flex connectors are designed for vibration only and provide little noise attenuation. In contrast, flexible acoustic connections address vibrations, abrasion, and breakout noise.
Acoustic flex joint on an industrial process fan
Process gas vent silencer
Industrial Exhaust Silencers
Industrial exhaust, or stack silencers, attenuate the noise produced in the stack exhaust. Silencers are designed based on the following factors: pressure drop, structural integrity, existing sound data, acoustic target, discharge, temperature, flow, and particulate loading. Oil & gas silencers attenuate the high noise levels of venting high-pressure gases. Vent silencers are used with a pressure relief valve for venting natural gas, pressurized steam, pressurized air, and other gases.
Oil & Gas Silencers
Compressor buildings exhaust large volumes of heated air from compressors, engines, and motors. Code requirements may dictate that all building supply and exhaust fan openings from compressor noise be attenuated.
Compressor station ventilation for heat relief and low noise levels
Wall of acoustic louvers
Acoustic Louvers
Acoustic louvers will provide some degree of attenuation when noise exits a facility through ventilation openings or barrier walls.
There are two main types of acoustic louvers: inclined flat and aerodynamic blades. Aerodynamic louvers are the best option where high airflow efficiency is needed. The top exterior of a blade is aluminum, and the bottom is perforated aluminum. The interior contains sound-absorbing insulation.
At SysTech Design, we specialize in industrial noise control equipment. We will work with you on the planning, sourcing, and implementing of suitable noise attenuation products. Contact us today to find out more!