Duravent 0406INC B-vent Increaser 4x6 Inch Double Wall

Product Description

The DURAVENT 0406INC is a double-wall B-vent increaser fitting used to transition vent diameter from 4 inches to 6 inches within Type B gas vent systems. Double-wall construction maintains proper clearance to combustibles throughout the transition, keeping the installation code-compliant. This fitting connects between standard B-vent sections and allows technicians to upsize venting where appliance output, combined venting, or system redesign requires a larger flue diameter. Licensed HVAC technicians and gas appliance installers are the primary trades working with this component.

This fitting is used in Category I gas appliance venting systems, including natural gas and propane furnaces, water heaters, boilers, and other negative-pressure, non-positive-vent appliances that require Type B double-wall vent pipe. It is suited for both residential and light commercial applications where an increaser transition is needed along a vertical or offset B-vent run. Install between compatible 4-inch and 6-inch DVP series B-vent sections.

Key Features

• Increases vent diameter from 4 inches to 6 inches in a single fitting
• Double-wall construction maintains required clearance to combustibles
• Designed for Category I negative-pressure gas appliance venting
• Fits between standard B-vent sections for inline diameter transitions
• Compatible with DVP series double-wall B-vent components

Compatibility

Designed for use with DVP series Type B double-wall B-vent systems, connecting 4-inch vent sections to 6-inch vent sections in Category I gas appliance venting installations.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified gas appliance installer in accordance with NFPA 54 and local mechanical codes. Shut off the gas supply and allow the appliance to cool completely before disassembling any vent sections. Ensure all joints are fully engaged and secured per manufacturer requirements, and verify that clearance to combustibles is maintained throughout the entire vent run after the increaser is installed.

Technical Specifications

• Inlet Diameter: 4 inches
• Outlet Diameter: 6 inches
• Construction: Double Wall
• Vent Type: Type B (B-Vent)
• Appliance Category: Category I

Standard Information

• Brand: DURAVENT
• Manufacturer Part Number: 0406INC