DIY Vertical Generator Exhaust: A Comprehensive Guide

Running a generator while camping or RVing can provide much-needed power, but dealing with the exhaust fumes can be a real problem. A vertical exhaust system can help redirect those fumes away from your living space, making your experience more enjoyable and safer. Let's explore how to build one, addressing potential issues and offering the best practices.

The Allure of a Vertical Exhaust

The primary benefit of a vertical generator exhaust is directing harmful fumes upwards, away from the immediate vicinity of your RV or campsite. This reduces the risk of carbon monoxide (CO) poisoning, a serious health hazard. Additionally, a vertical exhaust can help to:

• Minimize exhaust odors.
• Reduce noise levels.
• Comply with campground regulations in some areas.

Project Overview: Building Your Own Vertical Exhaust

One RVer detailed their experience creating a DIY vertical exhaust system for an Onan 4.0 generator. The initial design used PVC pipe, but they later discovered it wasn't suitable due to heat. Here’s a breakdown of their process, including the lessons learned:

1. Initial Design (PVC - Not Recommended):

   • Used schedule 40 1.25" diameter PVC pipe, cut into three 4-foot lengths.
   • Fittings were glued together for easy assembly/disassembly.
   • The inlet pipe was designed to slide over the generator's existing exhaust tip.
   • A small hole was drilled at the bottom elbow for condensate drainage.
   • A pin secured the PVC pipe to the generator exhaust tip.

2. The Problem with PVC:

   • Heat Sensitivity: The PVC melted after extended use, which is a significant fire hazard.
   • Important Note: While the initial tests showed manageable temperatures, prolonged usage caused the PVC to fail.

3. The Solution (Metal Conduit - Recommended):

   • Switched to 1.25" metal conduit with galvanized pipe fittings.
   • This provides a much safer, heat-resistant solution.

Key Considerations and Safety Measures

• Material Selection is Crucial: As demonstrated above, using the correct materials is paramount. Metal conduit and fittings are the ideal choice due to their heat resistance.
• Carbon Monoxide Awareness: Always be aware of the dangers of carbon monoxide. Even with a vertical exhaust, ensure proper ventilation and install a carbon monoxide detector inside your RV or camper. Learn more about Carbon Monoxide Safety.
• Secure Mounting: Ensure the exhaust pipe is securely mounted to prevent vibrations and potential disconnections.
• Venturi Effect: Consider incorporating a venturi design, similar to the Gen-Turi system offered by Camping World. This involves creating a system where the exhaust flow pulls in fresh air, cooling the gases and diluting the fumes.
• Proper Installation: The inlet pipe should fit snugly over the generator's exhaust tip to prevent leaks.

Enhancing Your Vertical Exhaust System

Beyond the basic construction, you can further optimize your vertical exhaust:

• Heat Shielding: Add heat shielding around the exhaust pipe, especially near the generator and any flammable materials.
• Flexible Connector: Use a short section of flexible metal exhaust pipe to connect the generator to the vertical section. This helps absorb vibrations and prevent stress on the system.
• Weather Protection: Install a rain cap at the top of the exhaust pipe to prevent water from entering the generator.

Alternative Products

If DIY isn't your thing, consider ready-made solutions:

• Gen-Turi: A commercially available system designed to vent generator exhaust upwards while diluting it with fresh air.
• Exhaust Extensions: Some manufacturers offer exhaust extensions that can be adapted for vertical use.

Before You Begin

• Consult Your Generator's Manual: Check for any specific recommendations or warnings related to exhaust modifications.
• Local Regulations: Be aware of any regulations regarding generator exhaust in campgrounds or RV parks.

By following these guidelines, you can create a safer and more enjoyable camping experience by effectively managing generator exhaust. Always prioritize safety and use appropriate materials to avoid potential hazards.