Generator Muffler

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Generator Silencers and Mufflers

In the world of generators, a silencer performs the same function for combustion engines as the muffler does for engines in automotive

and construction applications. Both reduce noise and exhaust emissions produced during combustion.

There are three basic designs of silencers:

Reactive Silencer - Internal construction consists of up to three chambers connected by a tube.
Exhaust noise bounces between the chambers reducing output noise.
Used for low to mid-frequency noise reduction.
Absorptive Silencers - Internal construction consists of fiberglass or E glass insulation. Exhaust noise is dampened as it flows through the insulation.
This method is used to reduce high frequency sound waves.
Combination Silencers - As implied, combines the construction of the reactive and absorptive silencers.
Absorption material is fitted into the chamber design of the reactive silencer. This allows reduction of all frequency designs.

Cylindrical Silencers

Cylindrical silencers were among the first shapes developed. They can be constructed to all three basic designs

and used both on inside and outside applications. The silencer can be mounted horizontally or vertically

to satisfy any application requirement. It is considered one of the most economical silencers.

Sound Rating for Generator Silencers

The sound intensity emitted from an exhaust system is measured in Decibels (dB). The dB is 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 basic grades. Industrial, commercial, residential,

and hospital grades were considered the industry standard in silencer manufacturing. During this period,

the amount of sound reduction for grade varied between manufacturers.

The Electrical Generating Systems Association (EGSA) developed a rating guide that provided consistent silencer ratings

for any manufacturer belonging to the association. This has become industry standard for manufacturing.

Common grades are: