Dometic 5-Inch Duct Adapter Kit - Furnace Duct Connection - Part# 31388

DometicSKU: 31388
Added to catalog: March 10, 2026

Sale price$23.63
|
In stock (50 units), ready to be shipped
FREE Delivery Estimate April 22 – April 25
1-Hour Cancellation Window

1-Hour Cancellation Window

You'll have 1 hour after placing your order to update your shipping address or cancel completely.

After that, we begin coordinating with our vendors to fulfill your order — at that point, cancellations and address changes usually aren't possible.

If you're unsure about anything, please reach out before ordering or cancel within the window.

The Dometic 5-Inch Duct Adapter Kit (Part# 31388) is an essential furnace service component that provides a secure connection between your RV furnace and the ductwork system. This adapter kit ensures proper airflow distribution throughout your RV's heating system, preventing air leaks and maintaining efficient heat delivery. RV owners replacing damaged ductwork or upgrading their furnace installation will need this adapter to create a professional, airtight seal.

Key Features

  • 5-Inch Diameter Design: Standard sizing fits most Dometic RV furnace duct systems for universal compatibility
  • Complete Adapter Kit: Includes all necessary components for a complete duct connection installation
  • Secure Connection: Engineered to create an airtight seal that prevents heat loss and maintains system efficiency
  • Genuine Dometic OEM Part: Factory-quality component designed specifically for Dometic furnace systems
  • Durable Construction: Built to withstand temperature variations and vibration during travel
  • Easy Installation: Designed for straightforward replacement by RV owners or technicians

Technical Specifications

Part Number 31388
Duct Diameter 5 inches
Part Type Furnace Duct Adapter Kit
Application RV Furnace Ductwork Connection
Manufacturer Dometic

Frequently Asked Questions

Q: Will this adapter fit my Dometic furnace?
A: This 5-inch adapter is designed for standard Dometic RV furnace duct systems. Measure your existing duct diameter to confirm compatibility before ordering.

Q: What's included in the adapter kit?
A: This is a complete adapter kit with all components needed to connect your furnace to 5-inch ductwork. Check the package contents upon arrival to ensure you have everything for installation.

Q: Can I install this adapter myself?
A: Yes, this adapter is designed for straightforward installation. Basic hand tools and understanding of RV duct systems are recommended. Ensure all connections are secure and airtight for optimal performance.

Q: Why is proper duct connection important?
A: A secure duct adapter prevents heated air from escaping into wall cavities, maintains furnace efficiency, reduces energy consumption, and ensures even heat distribution throughout your RV.

Why Choose Elkhart RV Parts?

At ElkhartRVParts.com, we specialize in hard-to-find Dometic RV furnace parts like this 5-inch duct adapter kit. Located in Elkhart, Indiana — the RV Capital of the World — we understand the importance of maintaining your RV's heating system with genuine OEM components. We stock authentic Dometic parts and ship them fast so you can get your furnace system back to peak performance. Our team of RV parts experts is here to help you find exactly what you need.

100% Authentic OEM Parts

Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.

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