Generator Silencers - Types and Sound Ratings
Generator Silencers - Types and Sound Ratings
EI Williams custom designs and custom builds silencers for your needs including vent silencers, engine silencers, fan silencers and industrial silencers to meet all system requirements.

Generator Silencers and Mufflers


Cylindrical SilencerIn the world of generators, a silencer performs the exact same function for combustion engines because the muffler does for engines in automotive and construction applications. Both reduce noise and exhaust emissions developed during combustion. Get additional information and facts about vent silencer

You will find 3 fundamental designs of silencers:


Reactive Silencer - Internal construction consists of as much as 3 chambers connected by a tube. Exhaust noise bounces between the chambers lowering output noise. Used for low to mid-frequency noise reduction.

Absorptive Silencers - Internal building consists of fiberglass or E glass insulation. Exhaust noise is dampened as it flows by way of the insulation. This method is used to lower high frequency sound waves.

Mixture Silencers - As implied, combines the building with the reactive and absorptive silencers. Absorption material is fitted in to the chamber design on the reactive silencer. This allows reduction of all frequency designs.

Cylindrical Silencers

Cylindrical silencers had been among the first shapes created. They will be constructed to all three standard designs and used both on inside and outside applications. The silencer may be mounted horizontally or vertically to satisfy any application requirement. It is deemed one of your most economical silencers.

Low Profile Silencers

Low Profile SilencerThese silencers can are available in different shapes such as, rectangular, oval, and round. The shape chosen is determined by the space readily available. They're commonly used in generators positioned in sound attenuated enclosures. The silencers must meet National Fire Protection Association (NFPA) guidelines.

When a generator operates inside a combustible environment, adjustments has to be produced towards the exhaust system to ensure that sparks generated within the combustion approach are certainly not emitted towards the outside atmosphere. Spark arrested silencers are typically cylindrical in shape and of a modified reactor design. This permits the carbon sparks to circulate inside the silencer dropping into a collection box. The collection box must be cleaned as portion in the upkeep program.

Exhaust gases can reach temperatures of up to 1400 degrees Fahrenheit. These gases are typically passed in to the atmosphere. Heat recovery silencers are used to use the heat in the exhaust gases just before it can be passed towards the atmosphere. This heat provide could be used for any system that needs an external heat supply (heated water).

Emission Control Silencers

Catalytic ConverterCombustion gases are comprised of many of gases. A few of the gases are really dangerous and some aren't so harmful. The Environmental Protection Agency (EPA) enforces exhaust regulations to cut down harmful exhaust gas emissions.

The EPA closely regulates emissions for generators that supply major power to a facility. Existing Tier IV regulations need the use of a catalytic converter. The basic converter is constructed of a honeycomb grid design which is placed within the exhaust system straight right after the exhaust manifold. This location enables the exhaust gas to become in the maximum temperature required for suitable operation. Lots of new silencers combine the converter design using the silencer.

Particulate matter content material of your exhaust gas can also be addressed in Tier IV regulations. Particulate matter filters is often used to minimize the soot content of the exhaust. The interior from the filter is constructed of ceramic material. Exhaust gas passes more than the material, soot is collected. Lean burn engines may also employ an additive to further reduce harmful emissions.


Sound Rating for Generator Silencers

Sound WaveThe sound intensity emitted from an exhaust system is measured in Decibels (dB). The dB is usually a unit of measurement used to express the ratio of one physical property to another represented on a logarithmic scale. Decibel A Weighted (dBA) is measurement used to approximate the human ear response to sound.

In the early days of rating silencers, there were four standard grades. Industrial, commercial, residential, and hospital grades have been regarded the sector normal in silencer manufacturing. Throughout this period, the amount of sound reduction for grade varied among companies. The Electrical Creating Systems Association (EGSA) developed a rating guide that offered constant silencer ratings for any manufacturer belonging to the association. This has become business normal for manufacturing.

Prevalent grades are:


Industrial Grade - Exhaust noise reduction of 15 to 20 dBA

Residential Grade - Exhaust noise reduction 20 to 25 dBA

Important Grade - Exhaust noise reduction of 25 to 32 dBA

Super Vital Grade - Exhaust noise reduction 30 to 38 dBA

Hospital Grade - Exhaust noise reduction of 35 to 42 dBA

Hospital Plus Grade - Exhaust noise reduction of 35 to 50 dBA

Extreme Grade - Exhaust noise reduction of 40 to 55 dBA

Super Extreme Grade - Exhaust noise reduction of 45 to 60 dBA

Each and every silencer and style might not be readily available in all grades. Every single manufacturer produces many styles in unique grades. Style production expense and physical capabilities from the silencer dictate grade availability.