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How to Make a Silencer for Generator – DIY Homemade Generator Silencer for Your Home

Generators can save you from many distress conditions; Imagine it’s a brutal humid night, and you experience an unfortunate power outage.

Your old generator can save you from that torture but may land you and your neighbors in another furry. You know it; the loud engine noise.

Yes, generators come with built-in mufflers, but sometimes they don’t render effectiveness, especially in most calm environments. So, what’s the solution?

Don’t be a head-scratcher!

You can make a DIY generator silencer box in your home. But, how to make a silencer for the generator? That’s another mystery to solve here. So, let’s solve it together!

How to make a Silencer for Generator – Some Fact Checks Before Diving in the Procedure

How to make a Silencer for Generator
How to make a Silencer for Generator

No, No, It’s highly doable.

But I wish you should be checking some facts or busting some myths before going to make a homemade generator box. So, quickly jump onto these;

  • A generator silencer box doesn’t quiet the loud machine at all; rather, it somewhat reduces the twinging noise (up to 50%, effectively)
  • You just need to be very good at hardwood craftsmanship, welding, or some mechanical works.
  • A silencer box can be a dangerous thing in some circumstances (if not taken care of)
  • You also have to plan storage for the generator silencer box as well along with the storage of a portable generator.
  • A DIY generator silencer isn’t the last option you left with; there are some other ways to reduce your generator noise. (Don’t worry, we’ll be discussing it)
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So, Making Your Own Silencer – This is How You Do It:

Warning: A 10 step-by-step guide ahead; you should be looking at the points attentively;

  1. Keep a strict Check on the Measurements:

This is the underpinning for your project’s failure or success. As every generator has a different size, the correct dimensions measurement is an ultimate demand here.

Silencer for Generator
Making Your Own Silencer – This is How You Do It

Whatever dimensions you map for your machine, the homemade generator box should be somewhat inches bigger than the original measurements. This is not illogical; mind it, but it’s for good ventilation and avoiding overheating the unit.

2. Cutting the MDX – Bring Your Inner Crafter to The Table:

You should be using MDX (Medium-density fibreboard)wood type for the container. Why? It’s less expensive, effective noise absorbent, and much more reliable. Anyways, mark the measurement of generators and cut it through the table saw, manual saw, or any other cutter; it’s up to you.  

3. Plan the Ventilation Wisely: 

Now before gluing the cut MDX fiberboard pieces, you have to plan the ventilation design. This can also affect the generator silencer design in both ways, positive or negative. If you are pretty new to this, the first ventilation should be on the backside of the Lid piece of the box.

Against this, the second ventilation hole should be opposite of the 1st ventilation hole, meaning, at the side of the container box.

4. Acoustic Caulk is The Key for Sound Proofing: 

Insulating the MDX pieces looks like art. You have to use a noise-proof substance/insulation to better cool off the sound waves wavelength. For that purpose, we will be using MLV (Mass Loaded Vinyl) sheets that are used as sound-deadening insulation.

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So, rather than using typical foam stuff, it’s better to use MLV as a soundproofing agent.

You can paste a 2nd layer of foam matting to the 1st layer of MLV.

Similarly, to seal any space or small holes, regular glue isn’t a wiser solution. Do the Acoustic caulking to make it a soundproof sealing agent. This will efficiently seal the sound waves deviated by the MVL.

But wait, your work is still not being done thoroughly. It’s time for deep insulation.  

Be a perfectionist, you can glue down an anti-vibration sheet on the walls and corners of the generator silencer box, so it may reduce vibration that also increases the generator noise generally.

5. It’s time for Assembly: 

Making Your Own Silencer – This is How You Do It
Generator Silencer

After you are done with the insulation and matting part, it’s up to you how you hook all the MDX sheets together to bring it in the shape of a homemade silencer box. You can consolidate the pieces through steel nails, clumps, or screws.

It all depends on which idea you go with, but assemble it considering short-term or long-term use with fixed assembly or disassembly design in your mind.

6. Last, Just Last! Put the Ventilation Ducts Before Testing the Silencer Box: 

You know your DIY generator silencer box can become a hazard to any property or life. Yes, due to poor ventilation that causes it to overheat. This is the only caution you have to deal with carefully. That’s why I urged to see the generator silencer design diligently

Anyways, you have to cover ventilation holes with ducts so it won’t cause combustion and cause your generator to overheat. Make sure to bend the duct multiple times so that sound waves get de-tracked from their linear path and effectively stop echoing the noise.

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Now, run your generator and test the silencer box if there is any leakage. In case of any hole, you can cover it with acoustic caulking.  

7. Some Other Ways for Silencing the Generator – Generator Silencer Box Alternatives

Factually, your homemade generator silencer isn’t the only solution to kill the generator noise. Some of the alternatives work well, and you also need to check these out.

8. Add a muffler – Only if you are good at welding and electronic works

The hose and water bucket – Attach one end of the hose pipe to exhaust and put the other end in a bucket full of water. To avoid any vacuum and suction of water back to generator, mark cuts to hose pipe to kill any vacuum

9. Use Rubber Mat Surface – Rubber efficiently absorb vibration, thus reduce noise

10. Add Distracters In front of Generators – Let’s say your generator has been placed in front of your living room. Place plywood, bamboo, or rubber sheets in front of your generator. This won’t kill the noise but will divert it.

The Bottom Line – Wrapping Up the Story

So, how to make a silencer for a generator? Hopefully, you are ready to get your hands dirty with the wood and welding work.

The Generator silencer box undoubtedly delivers a massive reduction in the noise; however, it also needs some intelligent design sense and excellent ventilation. Poor ventilation can cause severe damage to your machine.

About Charles Ingram

Hi, I am Charles your local Home Tech and Gadget Expert. I’ve been fascinated with electricity for as long as I can remember. I grew up in an old home in a rural setting, so the quality and continuity of our electrical service were spotty at best. Spending time without power (or running off a generator) gave me a lot of appreciation for the benefits of electricity. I love writing and talking about it.