Duravent 4DV48 B-vent Flex Connector Pipe 4x48 in

Product Description

The DURAVENT 4DV48 is a double wall air-insulated flexible B-vent connector pipe designed to bridge appliance flue outlets and Type B vent systems where rigid pipe cannot make a direct connection. The 4-inch diameter and 48-inch length give installers enough reach to accommodate offsets, minor misalignments, and tight mechanical room layouts. Double wall air-insulated construction maintains the annular air space required for safe surface temperatures on Category I gas appliance venting. Licensed HVAC technicians and gas appliance installers are the primary trade for this component.

The 4DV48 is suited for residential and light commercial Category I gas appliance installations, including gas furnaces, water heaters, boilers, and other naturally drafting appliances that terminate into Type B vent systems. It is used in situations where a short flexible run is needed between the appliance draft hood collar and the beginning of the rigid vent stack, particularly in retrofit work where alignment between the appliance and existing vent is imperfect.

Key Features

• 4-inch diameter matches standard Category I appliance flue collar sizing
• 48-inch length provides extended reach for offset and retrofit installations
• Double wall air-insulated construction maintains safe exterior surface temperatures
• Flexible design accommodates minor angular offsets and alignment corrections
• Compatible with Type B vent system connections as a transition connector

Compatibility

Designed as an OEM-style replacement and new-installation connector for Type B gas vent systems serving Category I naturally drafting gas appliances with a 4-inch flue outlet.

Installation Notes

Installation must be performed by a licensed HVAC technician or qualified gas appliance installer in accordance with NFPA 54 and the appliance manufacturer instructions. Shut off the gas supply and allow the appliance to cool completely before disconnecting or connecting any vent components. The connector should be kept as short and straight as practical and must not be concealed inside walls, floors, or ceilings. Secure all joints per local code requirements and verify draft operation after installation.

Technical Specifications

• Diameter: 4 inches
• Length: 48 inches
• Construction: Double Wall Air-Insulated
• Vent Category: Category I (Type B)

Standard Information

• Brand: DURAVENT
• Manufacturer Part Number: 4DV48