how to make a silencer for a generator

How to Make a Silencer for a Generator: The Ultimate Guide

Generator silencers are an important addition to any generator. They help to reduce the amount of noise that is produced by the engine, making them much quieter to operate. 

Making a generator silencer is a great way to reduce generator noise. Not only is it better for your ears, but it's also better for your neighbors! In this guide, we will show you how to make a simple and effective silencer for your generator.

We'll provide you with all the information you need to get the job done right. So, whether you're looking to quiet down a noisy generator or just want to learn more about how they work, here’s how to make a silencer for a generator!

Why Do Generators Make Noise?

One common complaint about generators is the noisy generator situation. This loud noise can be both annoying and dangerous, as it can interfere with conversations or cause hearing damage over time.

This problem can be exacerbated by poor insulation or improper installation.

The decibel level for human conversation is about 60 decibels. A generator that is running at full power can produce noise with decibels of up to 100. This is the equivalent of standing next to a lawnmower or being near an ambulance siren.

There are a variety of reasons why a generator may produce more noise than is acceptable. These include the following:

Power Capacity

Mobile generators push electricity through an engine, which could be noisy. The loudness of the engine is dependent on the amount of power it produces.

So, a generator that generates a lot of energy is generally going to be noisier than one that produces less.

Generator Quality

Often, a generator will produce less noise than a generator with less power-generating capacity. This usually happens when there’s a big quality difference between the generators.

Some generators come with robust pipe casings and rubber tires, which offer better insulation against noise and vibration. However, generators of this caliber are often more pricey.

Wear-Out and Damage

The older a generator gets, the more worn out it is. Worn-out generator engines are likely to become damaged and in need of repairs.

Damaged or worn-out generators are bound to produce more noise. They could also cause more problems aside from just noise. They may begin emitting smoke, for instance, or may become difficult to start up. 

If you notice your generator doing any of that, take it in for repairs.

Vibration on Hard Surfaces

A generator is very likely to make a lot of noise if it’s placed on a hard surface, such as concrete or wood. The vibrations of the generator combined with the hard surface are bound to produce more sound waves than if it were placed on a softer surface, which absorbs some of the sounds.

How to Reduce Exposure to Noise From a Generator

There are several ways to reduce your exposure to the noise level from a generator. These include:

Buy High-Quality Generators

When buying generators, shop for one with low decibels. Also ensure that they have anti-vibration mountings, such as robust pipe casings and rubber tires, which offer better insulation against noise and vibrations.

how to make a silencer for a generator

Install the Generator Correctly

Make sure to install your generator in an area where it will not be bouncing off hard surfaces. Place it on some type of cushioning, such as grass or hay.

Position the Exhaust Outlet Away From Your Home

The exhaust pipe should be positioned away from your living quarters, you can also place the generator as far away from your home or other buildings as possible: this will help to minimize the noise that is transmitted.

Install Proper Insulation Material Around Your Walls

Using insulation materials such as drywalls, fiberglass, and soundboards will help to keep noise from entering your home.

Wear Hearing Protection

If you're going to be near a running loud generator for an extended period, it's best to wear some type of hearing protection. This can include earplugs or earmuffs.

Install a Good-Quality Generator Silencer

A generator silencer can help reduce the noise levels by up to 50%.

What Is a Generator Silencer?

A generator silencer or sound muffler is a device that reduces the amount of noise produced by an engine.

How Does A Generator Silencer Work?

Generator silencers work by trapping or absorbing the sound waves created by the running engine when combustion occurs inside the cylinder. This muffles the sound and makes it much quieter for everyone around.

There are a few different designs of generator silencers, but they all work in more or less the same way. Some contain baffles that help to absorb the noise, while others use a perforated metal design that helps to diffuse the sound waves.

The Benefits of Using a Generator Silencer

There are plenty of benefits to using a generator silencer! Not only does it make your generator run more quietly, it can also help to prevent hearing loss by protecting the ear from long-term damage caused by too much exposure to loud noises. 

This is a common problem among those who work around loud machinery like generators all day long. This type of device will keep workers safe while on the job and make sure that they don't suffer any permanent damage over time.

It can also help you avoid complaints from your neighbors and could even save you some money on your energy bills!

Types of Generator Silencers

There are a few different types of generator silencers on the market, and each one has its advantages and disadvantages.

Perforated Metal Type

Perforated metal type silencers are typically made out of metal and use a series of holes or slots to diffuse the sound waves.

Absorption Type

This type of silencer uses baffles to reduce noise. It utilizes materials like fiberglass, foam, or rubber to absorb the sound waves. It is typically installed on generators that are used for commercial purposes.

how to make a silencer for a generator

Materials Needed to Build a Simple Generator Silencer

Materials that you'll need include:

Metal Sheets

Three pieces of sheet metal measuring 12 inches long by 24 inches wide (or any size that fits your generator).

It's important not to cut corners when working with this type of material because it will affect the sound absorption quality of your silencer. If possible, try and find something thick enough so as not to compromise on durability either way!


Two pieces of wood measuring six inches long by two inches wide for attaching each end piece. You could also use PVC pipe if desired, but make sure it has an inside diameter larger than two inches before cutting to size.

Paint or Spray Paint

You'll also need some type of paint or spray paint to coat your metal sheet with. This will help to reduce the amount of noise that is emitted from your generator.

Insulation Material

This can be anything from fiberglass, foam, or rubber. You'll need enough to completely cover the metal sheet.

Tools Needed:

  • Tape measure 
  • Metal saw
  • Paintbrush (or spray paint)
  • Stapler Screwdriver
  • Drill
  • Saw

How to Make a Silencer for a Generator: Step by Step

Now that you have all the materials you need, it's time to start making your generator silencer!

Step One

Cut the metal sheet into three pieces that measure 12 inches long by 24 inches wide. If you have a larger generator, you can make your silencer panels larger to fit.

Step Two

Drill two holes at each end of the metal sheet using a drill bit that is slightly smaller than the screws you will be using.

Step Three

Paint or spray paint the metal sheet with noise-absorbing paint. This will help to reduce the amount of noise that is emitted from your generator.

Step Four

Cut the insulation material to size and cover the metal sheet. Make sure to completely cover all surfaces of the metal.

Step Five

Attach the end pieces of the metal sheet using screws and a screwdriver.

Step Six

Staple the insulation material to the metal sheet. Start in one corner and work your way across, making sure to staple every few inches.

Your generator silencer is now complete! All you need to do is attach it to your generator and you're good to go!

Tips for Installing a Generator Silencer

Here are a few tips to keep in mind when installing your generator silencer:

  • Make sure the holes in the end pieces of the metal sheet line up before screwing them together. This will help to ensure that the silencer is properly aligned and functioning correctly.
  • If you're using PVC pipe for the end pieces, make sure to test fit it before cutting to size. You want the inside diameter of the pipe to be larger than two inches so that the sound waves can diffuse correctly.
  • Always follow the manufacturer's instructions when installing a generator silencer. Improper installation could affect the performance of your generator and may even be dangerous.


Reducing the noise level from a generator is important for a few different reasons. Not only is it annoying for everyone around, but it can also be dangerous.

Generator silencers help to reduce the noise level that is produced by an engine, making them much quieter to operate. We hope you enjoyed our guide on how to make a silencer for a generator!

Leave a Comment

Your email address will not be published. Required fields are marked *