How to Make Your Own Portable Generator Exhaust Extension

February 16, 2021 | By Ronny Bell | Filed in: Blogs.

In this modern world, where eco-friendly energy has become a thing of necessity, more and more people put an effort on being mindful over their carbon footprint. Generator is one amongst many mechanical equipment pieces that emit plenty of exhaust fume, which can be danger if it’s inhaled indoor. Using portable generator exhaust extension is a good way to make sure the emitted fumes can be directed outside, thus minimizing its harm. The exhaust extension kit is actually available online for RV, but there’s less option when it comes to portable generator. Luckily, it’s possible to modify one on your own with affordable price as explained below.

Why Do We Need to Extend Generator Exhaust

Portable Generator Exhaust Extension

Exhaust fumes from generator is a dangerous thing for your lungs if inhaled, especially if you’re exposed to it for long time. It contains harmful chemical for health and causes air pollution. One of the chemical substances it carries is carbon monoxide, which can cause poisoning with symptoms, such as weakness, dizziness, vomit, to loss of consciousness.

It is possible to prevent the carbon monoxide poisoning and other negative effects from generator releases by using exhaust extension. The extension is similar in hose physically, and it’s meant to forces the smoke away, resulting in safer and cleaner environment of work.

How to Make An Exhaust Extension For Your Portable Generator

Here are seven easy steps to create a portable generator exhaust extension:

1. Calculate your generator’s exhaust diameter

In order to make sure of secure joint between the generator exhaust and the extension, it is important to measure the exhaust diameter accurately. It can be done by using tape measure or ruler across the tip of exhaust, then increase the diameter with additional ¼ inch to ensure that the extension will fit perfectly.

2. Determine the desired exhaust extension length

To extend the generator exhaust into more open or well-ventilated area, you have to decide how long it has to be. It may depend on your preferences, but it is best to go with maximum length of extension that’s possible. After that, you need to purchase the extension material, which is available anywhere from 6 feet to 50 feet in the market.

3. Buy flex tube that suits with the exhaust dimension

The exhaust component of portable generator requires flex tube, which is tubing from metal material to create easier and more flexible routing. You have to purchase flex tube that has matching size and length of your desired generator exhaust pipe extension.

4. Use clamp with suitable size to secure the flex tube

You will need to use clamp with fitting diameter to the exhaust pipe to make sure that the flex tube is secured properly. It is easy to find clamps in material store, which available in various diameters. You may also need socket clamp that can be replaced by hose clamp if possible – but generally clamp works best for flex tube.

5. Fit the flex tube into generator exhaust pipe

After you get all the materials ready, it is time to move into next step. Set the clamp into the flex tube, and then put the flex tube to the generator exhaust pipe. Make sure that you secure the clamp firmly to avoid any leakage without harming the exhaust pipe. The flex tube should be able to budge easily without having the clamp to move as well.

6. Direct the extension flex tube to desired location

After the extension for exhaust pipe in your portable generator has been properly installed, it’s time to direct it to desired area. It may be outdoor space or other well-vented location that allows you to free the fumes to more open area. It is also necessary to ensure that the exhaust fumes won’t make way back into your working space, so you need to secure the pipe in its designated place.

Once you’re finishing using the generator, it’s important to remember that you need to dissemble the exhaust extension properly. This will ensure of its durability by preventing damage. Letting the extension to be connected constantly to the generator machine will raise the possibility of it is getting damaged – aside from difficulty to store the unit. Simply remove the extension pipe and store it away together or separated from the generator.

Can an Extended Exhaust Make A Generator Quieter

Generators in general create plenty of noise, and it doesn’t exclude the portable generator type. In fact, the average noise level of various models in the industry is between 70 to 80 dBA. This noise level may not be much of a problem when used in open outdoor secluded area or jobsite, but the same unfortunately cannot be said if you use the unit around neighborhood. Moreover, operating generator unit within garage or shop building may magnify the sound, producing louder noise than it typically does.

A lot of people wonder if adding portable generator exhaust extension will lower the generator sound. It is, unfortunately, not true. Lessening the noise level of a generator is an entirely different project than extending the fume exhaust.

That being said, there are plenty of ways you can lowering the exhaust noise, including installing muffler or using silencer box. A quick and simple research on the internet should provide you with sufficient information regarding this matter.

The Safety Tips

It may be important for you to install portable generator exhaust extension, but what’s not less important is ensuring that it works safely. Here are several useful safety tips creating and using the extension properly:

  • Measure all the needed components accurately in order to make sure you make a perfectly fitting connection
  • Double check before operating the generator to ensure that the extension is properly tightened to avoid leakage.
  • Always direct the exhaust extension to open or well-ventilated area.
  • Use high quality components to ensure longevity and safety.

Portable generator exhaust extension is one of many units’ accessories that you can apply to improve its system. Regardless of whether you want to enhance the machine’s performance or lengthen the durability, having the right accessories or additional component can help to achieve that.


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