Williams 9304 Vent Extension

The Williams 9304 Vent Extension is a critical component for completing through-the-wall installations of Direct Vent (DV) Wall Furnaces. This 15-inch extension is engineered specifically for the Williams 14038 Series (14,000 BTU models), including compatible Mfr. Nos. 1403821 and 1403822. When standard vent lengths are insufficient due to structural depth, this kit accommodates wall thicknesses from 9 inches up to 15 inches. Constructed from heavy-duty galvanized steel, it ensures high-temperature resistance and long-term structural integrity for sidewall venting applications. The 90-degree pattern angle and horizontal vent direction require precise top mount installation. This kit includes the necessary flue tube extensions and air inlet tubes needed to safely bridge the gap between the furnace and the exterior vent cap. Technicians should verify the furnace rating plate to ensure this 9-inch diameter system matches the specific requirements of the gravity direct-vent unit being serviced.

• Ensures safe combustion air intake and flue gas exhaustion through deep wall structures up to 15 inches.
• Compatible with Williams 14,000 BTU Direct Vent wall furnaces for a seamless fit without field fabrication.
• Durable galvanized steel finish resists corrosion and maintains rigidity under constant heat cycles.
• Supports code-compliant horizontal sidewall venting for residential and commercial heating projects.

Which furnace models work with this extension?
This part is purpose-built for the Williams 14038 series, including 1403821 and 1403822 models. If you are working with a 22,000 or 30,000 BTU unit, you will require a different part number.

What is the maximum wall thickness this kit can handle?
The 9304 extension is designed for walls measuring between 9 inches and 15 inches in thickness. For walls thicker than 15 inches, a 24-inch extension kit may be necessary.

Can this extension be cut to size in the field?
Yes, technicians can measure the wall depth and trim the tubes according to the provided installation instructions to ensure the tube ends are flush with the outside wall.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.