Duravent 0518PI B-vent Round Rigid Pipe 5x18 in Double Wall

Product Description

The DURAVENT 0518PI is a double wall air-insulated B-vent round rigid pipe section designed for Category I gas appliance venting systems. Measuring 5 inches in diameter and 18 inches in length, this pipe section maintains flue gas temperature through its air-insulated double wall construction, which also satisfies clearance-to-combustibles requirements for B-vent installations. It connects using a twist-lock mechanism for secure, field-efficient assembly. Licensed HVAC technicians and gas appliance installers work with this pipe section when constructing or extending vertical vent systems for natural gas and propane appliances.

This pipe section is suited for residential and light commercial installations where Category I appliances require a listed B-vent venting path. Typical applications include venting upright gas furnaces, water heaters, boilers, and other natural draft appliances. The 5-inch diameter accommodates common mid-range appliance vent collar sizes, and the 18-inch length is useful for short riser runs, offset segments, and connector transitions within a vent chase or utility space.

Key Features

• Double wall air-insulated construction maintains flue gas temperature for reliable draft
• 5-inch diameter and 18-inch length suit common Category I appliance vent collars
• Twist-lock connection system enables fast, secure field assembly without additional fasteners
• B-vent listed construction meets clearance-to-combustibles requirements per NFPA 54 and appliance manufacturer specifications
• Round rigid pipe profile supports straight vertical and connector runs

Compatibility

Designed as an OEM-style replacement and new-installation component for Category I gas appliance B-vent venting systems requiring a 5-inch diameter round rigid pipe section.

Installation Notes

Installation must be performed by a qualified HVAC technician or licensed gas appliance installer in accordance with NFPA 54, the appliance manufacturer instructions, and all applicable local codes. Shut off gas supply and allow the appliance to cool completely before servicing any vent section. Ensure all twist-lock joints are fully engaged and that the assembled vent system maintains required clearances to combustibles throughout its run. Do not use B-vent pipe sections in positive-pressure or Category III or IV venting applications.

Technical Specifications

• Diameter: 5 inches
• Length: 18 inches
• Wall Construction: Double wall air-insulated
• Pipe Shape: Round
• Pipe Type: Rigid
• Vent Category: Category I (B-Vent)
• Connection Type: Twist-lock

Standard Information

• Brand: DURAVENT
• Manufacturer Part Number: 0518PI