Duravent 0418PI B-vent Round Rigid Pipe 4x18 Inch Double Wall

Product Description

The DURAVENT 0418PI is a double-wall, round rigid B-vent pipe section engineered for Category I gas appliance venting systems. Measuring 4 inches in diameter and 18 inches in length, this pipe section maintains flue gas temperature through its double-wall construction, which also satisfies required clearance-to-combustibles specifications. Connection is made via a twist-lock system for secure, repeatable assembly. Licensed HVAC technicians and gas appliance installers use this pipe to build or extend vertical B-vent flue runs on natural gas and propane appliances rated as Category I.

This pipe section is suited for residential and light commercial gas venting applications where Category I, draft-hood-equipped appliances discharge at non-positive static pressure. Common installations include gas furnaces, water heaters, boilers, and other atmospheric-burner appliances vented through interior chase or exposed vertical runs. The 4-inch diameter accommodates typical residential appliance collar sizes. The 18-inch rigid section length helps span standard stud or joist bays and connect vent components with minimal joints.

Key Features

• Double-wall construction maintains flue gas temperature for reliable draft in Category I systems
• 4-inch diameter fits common residential gas appliance vent collars
• 18-inch rigid section length for straightforward vertical run assembly
• Twist-lock connection system provides secure, tool-minimal assembly and disassembly
• Round rigid form holds alignment in framed chases and open vertical runs

Compatibility

Designed as an OEM-style replacement and standard component for Category I atmospheric-burner gas appliance B-vent systems requiring 4-inch diameter rigid vent pipe.

Installation Notes

Installation of B-vent pipe must be performed by a licensed HVAC technician or qualified gas appliance installer in accordance with the appliance manufacturer instructions and IFGC requirements. Always shut down and allow the appliance to cool before servicing any vent section. Maintain required clearances to combustibles throughout the vent run as specified by local code and the National Fuel Gas Code. Never mix B-vent components from different manufacturers or diameter classes within the same vent system without verifying compatibility.

Technical Specifications

• Vent Type: B-Vent (Type B)
• Construction: Double Wall
• Pipe Diameter: 4 inches
• Pipe Length: 18 inches
• Shape: Round
• Connection Type: Twist-Lock
• Application: Category I Gas Appliance Venting

Standard Information

• Brand: DURAVENT
• Manufacturer Part Number: 0418PI