Duravent 0403PI B-vent Round Rigid Pipe 4x36 in Double Wall

Product Description

The DURAVENT 0403PI is a double-wall, round rigid B-vent pipe section designed for Category I gas appliance venting systems. Measuring 4 inches in diameter and 36 inches in length, this pipe section maintains flue gas temperature through its double-wall construction, which also satisfies required clearance-to-combustibles specifications. Twist-lock connections allow for secure, tool-minimal assembly during installation. Licensed HVAC technicians and gas fitters are the primary installers of this component in residential and light-commercial gas venting runs.

This pipe section is suited for vertical and offset venting applications in residential and light-commercial settings where Category I, fan-assisted or naturally drafted gas appliances require a listed B-vent system. Typical applications include venting gas furnaces, water heaters, boilers, and similar atmospheric-burner appliances. The 36-inch rigid section accommodates straight runs between fittings, reducing the total number of joints needed in a venting assembly.

Key Features

• Double-wall construction maintains flue gas temperature for proper draft in Category I venting systems
• 4-inch diameter x 36-inch length rigid section for straight venting runs
• Twist-lock connection system enables secure, repeatable assembly without separate fasteners
• Round rigid profile compatible with standard B-vent fittings, elbows, and terminations
• Designed to meet clearance-to-combustibles requirements for listed B-vent installations

Compatibility

Designed as an OEM-style replacement and new-installation component for 4-inch double-wall B-vent systems used with Category I gas appliances.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified gas fitter in accordance with the appliance manufacturer's instructions and applicable codes, including NFPA 54 and local mechanical codes. Shut off the gas supply and allow the appliance to cool completely before servicing or extending an existing vent system. Support pipe sections per local code requirements and confirm all twist-lock joints are fully engaged before restoring appliance operation. Do not mix B-vent components from different manufacturers or nominal diameter sizes within the same venting system.

Technical Specifications

• Diameter: 4 inches
• Length: 36 inches
• Wall Construction: Double Wall
• Pipe Shape: Round
• Pipe Type: Rigid
• Vent Category: Category I (B-Vent)
• Connection Type: Twist-Lock

Standard Information

• Brand: DURAVENT
• Manufacturer Part Number: 0403PI