How to Quiet a Generator – Generator Noise Reduction

Updated On: May 8, 2021

One of the biggest complaints of having a generator is certainly the noise it produces. It’s not good for obvious reasons but more than that, loud noises that generators seem to constantly make when active not only irritate people but cause several health conditions like high blood pressure. Headaches, irritability, and excess stress are just other collaterals. Generators are also commonly used in educational institutions and the noise can hamper the attentiveness and focus of the students.

Make Generator Quiet Generator

But let’s not forget the utility of a generator, a piece of machinery that’s a result of human miracles. In this specific case, a generator can help us in situations where there’s less to no other alternatives. When an inevitable power outage happens, a generator is your best bet. People running businesses that rely heavily on consistency and being active like server computers, seem to must have a generator or at least another alternative that’s much more expensive. You can go for tested quiet generators available in the market. It’s not in the scope of this article so we will keep that aside for now. 

What’s with Generator and Noise?

Most traditional compact generators produce power through an inner combustion engine that operates on fuel like diesel. As you run the generator little blasts are going off within it which produces the force you are utilizing. This burning alone can be very uproarious however regardless of whether that is fairly protected the fumes makes a channel for the commotion. Vapor from the burning must be vented so generators are fitted with a fumes port. This port fills in as a channel for all the clamor, noises from the inside motor to vent out. 

In some cases, it may appear as though these little versatile motors are stronger than bigger motors like those in a vehicle. For the most part, it is correct that they certainly are, considering their size. The two sorts of motors, the vehicle one and the generator one. They have 2 different casings and enclosures. For portable generators, the motors are encased in slight air-cooled materials that indeed don’t protect against sound well. Vehicle motors are encased in steel and fluids. The difference adds to the boisterous clamor of the portable generator. As a conclusion of ignition, a generator that produces more force will frequently be noisier. Increasingly inward ignition rises to more power, likewise rising to more commotion. This is particularly obvious in less expensive models.

With versatile generators the more you pay the calmer they can be, even at higher yields. Generators that make less commotion are increasingly costly therefore the noise decrease is generally justified. Clearly, the closer the generator is to you the stronger the sound will be however there are different things to consider. On the off chance that the generator is on a shallow or flimsy surface, the vibrations from that can intensify the sound.

Likewise, on the off chance that you place the generator close to dividers or even the side of an RV, the sound can skip off of those things and be enhanced as well. Open spaces make for calmer-sounding generators. Remember that the sound degree of a generator is estimated in decibels (dB). Convenient generators as a rule fall between 60-90 dB yet some go above 100 decibels. For correlation, a normal dishwasher or vacuum cleaner makes around 60-70 dB of commotion. That commotion is tolerable in little blasts but after some time it can without much of a stretch make somebody insane. So, here are some ways to quiet down a generator that’s making you go insane. 

Reducing Generator Noise

The positioning of the Exhaust Pipe

This is perhaps one of the easiest things to do. The exhaust pipe of the generator. You should consistently put this side of the generator confronting away from your work area or living space. With certain models of generators, it’s likewise conceivable to point the fumes pipes upward toward the sky. Both of these positions will coordinate the commotion made straightforwardly from the fumes from you. A standard generator will have even (horizontal) exhaust pipes.

The basic procedure of changing them to a vertical position will coordinate sound waves upwards and away rather than towards you or everyone around you. There will remain a considerable measure of noise still voyaging on a horizontal level but it will lessen the commotion somewhat. If if you can’t point the fumes upwards, point it away from your home.

Sound Deflectors

Introducing sound redirectors is another extraordinary method to diminish the commotion levels of your generators. A sound redirector is a gadget that helps in diverting the sound away from a particular region. It is a value purchasing gadget to introduce in the zones you would prefer not to hear generator noise from. 

This gadget doesn’t make the generator itself calmer or lessen any of the commotions it makes; it just gets the noise far from contacting you. Sound redirectors are promptly accessible in the market. So, a sound diverter/deflector is a perfect transitory arrangement. If you are searching for something increasingly lasting, to improve the viability of your generator, you can choose sound deflectors from different alternatives.

DIY Deflectors

While it sounds very technical it is a straightforward job to execute. It can go a long away in case you’re attempting to see how to calm a generator however much as could be expected. The main things you’ll require are 4 sheets of pressed wood and a sheet of non-combustible material. Drywall is a decent material for this as it is generally heatproof. Every one of the pieces ought to be around 4 feet wide and 3 feet tall. You can prop every one of these pieces facing the generator at explicit points. Make certain to utilize the bit of drywall for the side of the generator that houses the fumes. You don’t need your redirectors bursting into flames.

By putting these bits of wood around the generator at a point, you leave space for wind stream while avoiding the sound waves down into the earth. You can promptly bring down the decibels that your generator is putting out without influencing execution negatively. 

Here’s a video for a better point of reference: 

Generator Silencers and mufflers

One of the most well-known systems individuals use to calm a generator is to introduce a suppressor. A suppressor’s main responsibility is to stifle the sound coming out of the pipes joined to the engine of the generator. Inside the suppressor are punctured cylinders that are intended to divert the sound waves from the engine to bring down the commotion that in the long run leaves the exhausts. The exhaust pipes are perhaps the most intense part of the generator, second only to the engine itself. By improving the nature of the suppressor, you can hope to calm down the generator by quite a bit. While supplanting the suppressor on your vehicle or truck might be simple, finding a suppressor that will accommodate your generator might be troublesome. This is on the grounds that there are such a significant number of sorts of generators with various measured exhaust pipes available.

These silencers work in a simple method what you do is install the muffler or silencer towards the end of the exhaust pipe on the generator. It normally brings about a decrease in noise by a sum of around the sub 15 dBs once everything is done properly. They are moderately reasonable and simple to apply on almost every model of a compact generator. Search for a silencer explicitly made for generators instead of simply any business/mechanical silencer you can discover. A few people decide to add vehicle suppressors to their generators, however, in the event that you go this course, you’ll have to purchase and amass extraordinary parts to help connect everything. It requires a touch of expertise. If you understand the ideas that go into a suppressor you can even make your own at home; be that as it may, this ought not to be endeavored by anybody other than the most educated and expert DIY lovers. It has high risks associated with it and we don’t recommend it for most people. Generator silencers work equivalently with combustion engine suppressors in car motors and engines. The silencers lessen the sound delivered during the combustion process. Generator silencers are mainly divided into 3 classes.

Each classification decides the degree of commotion decrease applied to your generator.

  • Reactive silencers: They ought to be installed with a cylinder to the exhaust of the engine. The suppressor has three inward chambers. The noise contracts between the chambers and lessens the commotion delivered by the generator. A responsive silencer is to be utilized to decrease low to mid-level noise produced by a generator. 
  • Absorptive Silencer: This is a silencer with E glass or fiberglass protection in its inward development. At the point when associated with the generator exhaust, it hoses the vibration and sound created by the motor. Absorptive silencers are ideal for decreasing the high recurrence commotion level of the generators. 
  • Combination silencer:  As the name proposes, it joins the innovation of absorptive and reactive silencers. It’s fixed like the various silencers. This silencer lessens all degrees of sound recurrence from generators. Before applying any silencer on your generator, contact a professional. An expert will help you in picking and fixing the best silencer on your generator. 

Rubber Feet for generators

Generators produce sound vibrations. In the event that the vibration impact is lessened, the general commotion will lessen too. Along these lines, regardless of whether it’s at home or outdoors, don’t put the generator directly over a wooden board or cement. They amplify vibration quality. Rather, place the generator on the ground. The earth will ingest vibration. 

The most ideal path is to put an elastic tangle or anti-vibration pads under the generator especially the high output generators. The counter vibration pads are usually used on things as washing machines work impeccably on generators. The pads retain all vibration wave from the generator. It diminishes the auxiliary noises from your homes and campgrounds.

Distancing the Generator Itself

This is one of the most significant factors in ensuring your living area or working area remains calmer while utilizing a generator. 

Most generator brands will show what the decibel rating of that specific model is. These decibel evaluations are estimated at around 7 meters out from the working generator by and large. So, a decent dependable guideline is to get your generator at any rate 20 feet far from your space in the event that you require to have that level of sound range. On the off chance that you have the space and absence of outdoors neighbors, at that point putting resources into some hardcore extra-long electrical ropes will permit you to put your generator as distant as you’d like. 

Good DIY Alternatives

Baffle Box or Soundproof Box for Generators

While the above tips can assist with decreasing the commotion somewhat, they won’t verge on dispensing with all the noise. They will improve it yet you will even now have an exceptionally uproarious generator to battle with. The best way to get a generator calm is with a soundproof box. Since the case needs ventilation, it will never be completely soundproof however an all-around made box will make a noteworthy enhancement for the commotion originating from the generator. However, it’s important to think of the vents. Without vents, the generator will overheat and this will cause harm. Presently, you can purchase a soundproof box for your generator however assembling one isn’t excessively testing and will spare you a decent amount of cash. In the event that you have fundamental DIY aptitudes and two or three hours to waste, you can assemble one reasonably without any problem. Building it yourself will permit you to plan and makes it precisely to your prerequisites and give you some gloating rights as others admire your handicraft. 

Furthermore, it is a fun DIY venture unlike installing a vehicle silencer to a generator by yourself which is risky. Another advantage of this undertaking is the materials are generally reasonable and this won’t be a costly activity.


  • Measuring Tape
  • Paper and pen
  • Right-angled ruler
  • MDF boards 
  • MLV
  • A saw (circular or table)
  • Glue
  • Foam mats
  • Acoustic Chalk like Green glue
  • Screwdriver and hammer
  • Ventilation duct
  • Vents

Measure the generator

Generators come in different shapes and sizes and this requires you to be mindful of the box that you will be making. Pay attention when you are measuring the generator and make notes of the measurements. It is to make sure your generator fits when the construction of the box is finished. You can simply use a measuring tape to measure the size of the generator. A rough measurement will do, just make sure you make the box bigger than the measurements taken and measure somewhat sparingly.

Cutting the box

You can use MDF boards to cut out a box but you do not need to strictly stick to MDF. Fireproof materials and woods are recommended. mark the estimations on the MDF. Utilizing your pen and the right-angled ruler, recheck your measurements two to three times prepare to cut. Use a round or a table saw, whichever you’re using to cut the board, keep in considerations that you’re focusing the marks and measurements on the board that you made beforehand. Cut out all and make all the necessary cuts.

Cut out Ventilation holes

Take the ventilation duct that you bought for this undertaking and measure the diameters for the holes. On the flip board, you shall now mark out two circles.

  1. The primary imprint ought to be situated on the top (roof) bit of your container. You need to create the cutout in a way such so it is closer to one side rather than in the middle section of the board.
  2. The subsequent circle should be made on the boards that are intended to be a side (or divider) piece. Just Imprint/mark the circle on the opposite side from where you made the other circle (the roof cutout in this case).

After everything has been done as determined by the directions, set out your divider’s walls on a table, placing the “roof/ceiling part” one in the center with the remainder of the “divider wall cutouts” around it.

Installing MLV Insulation

The thing you have to keep in mind about soundproofing is that layers are significant. Layers of sound gaps and free space, layers of materials, and everything. An extraordinary material to use for soundproofing is surely MLV layers for protection against noise and good insulation. This is the base layer that you will use to construct your soundproof generator box. The key thing you have to do is measure the bits of MDF that you cut out for the packaging and cut the MLV to that size and glue it down with stick direct to the inward sides of your case. The edges of the MLV assurance can be difficult to stick down suitably, so you’ll have to use green glue to manage this issue. 

Sticking Foam Mat

Foam mats will help drastically lessen the noise of your generator in your soundproof generator box. Along these lines, what you’ll do is include this layer onto your dividers and roof of the box. You’ll need to take the mats that you have and mark the estimations of your divider walls and roof walls and cut them correctly as instructed. Paste the mats down with glue on the MLV and redo the same with the edges with the green glue.

Assemble the Box

Collect the dividers around the roof and nail or screw them into place. You can likewise introduce a few pivots so you have simple access to your generator. 

Install Vent Duct

Spot the vent hoses into the openings that you made in sync 3, and try to fix them into place since you don’t need them hopping around. The last touch to your soundproof generator box that requires adding is to include a little vent directly over the openings. When you’ve finished these, it means, your soundproof generator box is fit to be used.

Water as noise Suppressor

All you’ll require for this are a 5-gallon container of water, a hose, and clip to tie down the hose to the pipe. Make certain to put the generator at the higher ground than the pail of water. You don’t want the water streaming reverse into your generator’s pipe. You can likewise jab a couple of little holes in the hose in the event that you need to be extra mindful to not permit a reverse of water.  The arrangement is genuinely basic. Associate the hose to the fumes pipe utilizing your clasp. At that point place the opposite side of the hose into the water. The water will act as a suppressor to the exhaust commotion originating from the generator. By utilizing this water suppressor technique, you can hope to calm down the generator around by around 5-7 Db as per our results. It’s a preferable technique for the smaller generators like the compact generators and the portable generators that tend to be smaller lower watt generators.

About Steven Smith

For the last 20 years, I have been working as a professional contractor in many construction projects. From my childhood, I love to work with different kinds of power tools. In my spare time, I love to do a different kind of DIY project. It gives me a kind of inner satisfaction.

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