Duravent 0405INC B-vent Increaser 4x5 Inch Double Wall

Product Description

The DURAVENT 0405INC is a double-wall B-vent increaser fitting designed to transition vent diameter from 4 inches to 5 inches within Type B gas vent systems. This fitting connects between existing vent sections where a diameter increase is required, allowing the system to step up to larger vent pipe without interrupting the double-wall construction. Proper double-wall design maintains required clearances to combustibles throughout the transition. Licensed HVAC technicians and gas appliance installers use this fitting during new vent installations and system modifications on Category I gas appliances.

This increaser fitting is used in residential and light commercial Category I gas appliance venting applications where the vent system must transition from a 4-inch diameter run to a 5-inch diameter run. Typical scenarios include connecting to a larger vent manifold, stepping up at a tee, or meeting manufacturer-specified vent sizing requirements for longer vent runs. The fitting is installed inline between standard DVP-series B-vent sections.

Key Features

• Increases vent diameter from 4 inches to 5 inches in a single fitting
• Double-wall construction maintains clearances to combustibles at the transition point
• Designed for Category I gas appliance venting systems
• Installs inline between standard B-vent sections for seamless integration
• Compatible with DVP-series double-wall B-vent components

Compatibility

Designed for use with DVP-series double-wall Type B gas vent systems, transitioning from 4-inch to 5-inch diameter vent sections in Category I gas appliance 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 servicing any vent components. Ensure all vent joints are properly engaged and secured per the manufacturer instructions, and verify that required clearances to combustibles are maintained throughout the entire vent system after installing this fitting.

Technical Specifications

• Inlet Diameter: 4 inches
• Outlet Diameter: 5 inches
• Construction: Double Wall
• Vent Category: Category I (Type B Gas Vent)

Standard Information

• Brand: DURAVENT
• Manufacturer Part Number: 0405INC