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Can You Extend A Generator Exhaust [A Step-by-Step Guide]

Generator exhaust in a closed area can be a lethal thing. Exhaust releases fumes that carry carbon monoxide which is both colorless and odorless. An extension is often helpful to get the fumes out of the car. 

You might have thought or even tried to install an extension to generator exhaust. But you’re most likely wondering if it’s even possible.

Can you extend a generator exhaust?

Yes, you can extend your generator exhaust. To install a generator exhaust extension, measure the dimension of the generator. And then find the right extension. Afterwards, clean the generator exhaust thoroughly and attach the extension tube. Use the clamp to secure the extension tube and shift it to a suitable position. Finally, test the installation. 

Here is a brief idea on how you can install an extension to your generator exhaust. I‘ve got an entire article dedicated to this topic, so hop right in!

Why Do You Need to Install a Generator Exhaust Extension? 

Generator exhaust creates lethal fumes carrying carbon monoxide. Which is something you don’t want to breathe in. 

So, the number one reason for you to install an exhaust extension is to keep the fumes away from you. 

Your workstation may be situated somewhere close to the generator. In that case, it might be a good idea to install an exhaust extension. Even if your workstation is not in a closed proximity. Or, the generator is on the porch.  You still might breathe toxic fumes if there’s a lack of wind. 

Also, the toxic fumes can build up in a semi enclosed area such as a garage or workshops. This can be quite dangerous for you. On top of that, Carbon Monoxide can cause some serious illnesses. This toxic gas will make you feel nauseous leading to suffocation. 

Good for you, a tube-like extension can vent the toxic fumes out in the clean air. 

Even if you suspect that fumes are not building up in your workstation. It’s still a good idea to install an extension to your generator exhaust. Just like getting legal generator interlock kits.

How To Install an Extension to Your Generator Exhaust?

Installing an extension to the generator exhaust can seem difficult. But you don’t have to be worried, the process is quite easy especially if you’re following the guide I’ve provided for you.

I have divided the entire procedure into 7 simple and easy steps. This will help you to get your job done hassle free. So check out the steps below-

Tools Needed 

But wait, you will need the right tools to install the extension. So make sure you’ve got all the necessary tools at hand before starting. Here’s what you need-

  • Ruler/Tape Measures
  • Vernier Calipers 
  • Screw Driver
  • Small Socket 
  • Drill
  • Walker Exhaust 36326 Pipe-Flex Kit (2.5″ ID)

Got all the tools ready? Great, let’s start the process then!

Step 1 of 7: Determine the Required Measurements

Knowing the accurate measurements of your exhaust’s diameter is essential. It will help you greatly while buying the extension kit or the parts to build one by yourself.  If the parts do not match, the project will fail. 

Also, knowing the right length of the extension is important. It should be lengthy enough to reach the clean air. 

Furthermore, it is essential to leave a 0.07 centimeter allowance gap for the extension tube. Make sure that the extension tube fits properly but it should not be too tight. Fitting it too tightly will cause trouble while attaching or detaching it in future. 

So take the measurements accurately using a measuring tape or a ruler. You can also use a vernier caliper for greater accuracy.

Step 2 of 7: Find Out the Right Extension

You will need the measurements of the exhaust to find the perfect extension tube. 

There are generally two extension tubes used. One is a flex tube and the other is a non-flexible pipe. The non-flexible pipe is usually made of steel. It is recommended to use a flex tube but you can use both. 

The flex tube is much more versatile. As a wide range of length and dimension of it can be found. It is also metallic, so it will not melt in excessive heat. 

Flex tubes are also durable and easily can be found in different price ranges. 

Here are my suggestions on flex tubes, in case you were looking for one. Take a look at them-

Product 1
Product 2

Step 3 of 7: Clean the Generator Exhaust 

Now you’ll need to clean your generator exhaust if you have used it before. It is essential that your exhaust is clean before the extension installation. 

Carbon and oily grime will prevent the new parts from fitting securely. Cleaning will also prevent any future loosening. 

Step 4 of 7: Install a Clamp 

A pipe clamp will strongly secure the extension tube. Usually two clamps are found in the market. One is a pipe clamp and the other is hose clamp. The pipe clamp works best with the flex tube. 

Hence I recommended using a pipe clamp with the flex tube. 

Step 5 of 7: Attach the Extension 

I’m assuming that your measurements were accurate and you succeeded in purchasing the right tubes. In that case, attaching the extension with the exhaust should be an easy process. 

Slide the flex tube on to the exhaust firmly. Don’t forget to leave a gap of 0.07 centimeter between the exhaust and the extension tube. After attaching the extension tube, slide the clamp over the tube. 

Use a properly sized socket or screwdriver to tighten the screws on the pipe clamp. Don’t tighten it too loosely or too strongly. Both will have negative consequences.

Step 6 of 6: Extend Through Shelter Wall 

You’ll find some shelter with pre-drilled holes in them for extension purposes. But if your shelter doesn’t have one, you may need to create an opening. 

The opening level should be equal to the generator exhaust. Therefore, the extension will easily pass through. 

Also, be aware that the materials around the opening are non-flammable. Generally, the exhaust extension gets quite hot when the generator is operating.

By following these steps, you can make your own generator exhaust extension. 

Step 7 of 7: Test the Installation

The final step in the entire procedure is the test run of the installation. The extension should be at least a couple of inches away from the shelter. 

Also, it should be away from any window or door. The windows and doors can cause a draft. This will bring the carbon monoxide inside of the shelter. 

To have the test run, turn on the generator and leave it on for ten minutes. Make sure the generator doesn’t stop running

Check if there are any leaks in the flex tube at the attached area. Also, where it extends to the outside as well. Additionally. Look for any odor due to poor ventilation. 

Congratulations, you’ve successfully installed an extension to your generator exhaust. This might lead to you having an extension at your life-span.

Silencing Your Generator while extending

Generators usually require massive voltage to operate. With that, they make a lot of noises too. The noises coming out of the generator is also a health hazard. Someone exposed to this noise for too long might face permanent deafening. 

Adding an extension to your generator exhaust might reduce the noise to some extent. But the remaining noises can still cause permanent hearing problems.

In order to quieten your generator, you should keep it far away from your workstation. Also, installing a sound deflector can minimize the damage. 

In addition, placing the generator on rubber feet or in a sound absorbing baffle box will also work. You can also make a silencer for your generator to help reduce the noise.


Question: Can you pipe generator exhaust?

Answer: Yes, depending on where your generator is located, you may need to install an extension. You can use a generator extension kit or buy the parts and make one by yourself. This procedure will replace the toxic fumes of the generator to a different place. 

Question: Can I put a quieter muffler on my generator?

Answer: Yes. You can add a baffler or a muffle to reduce the noise of the generator. Although it’ll not reduce the noise to a huge margin. But this will reduce the noise by 10-15 decibels. 

Question: Can I put my generator in the garage if I vent it?

Answer: It is not recommended by the manufacturers to place and operate the generator in the garage. There are many safety issues. Primary one is carbon monoxide. A small leak in the exhaust or extension pipe will intoxicate the entire infrastructure.

Final Words

This was the answer to your curiosity on can you extend a generator exhaust. I tried to explain the process as thoroughly as I could. Hopefully you’ll not face any issues after this read.

If you do, take help from a professional.

Till then, have a beautiful day!