Hart Cooley 4ADFC3 Flexible B-vent Pipe 4x36 Inches

Product Description

The HART COOLEY 4ADFC3 is a flexible B-vent pipe section measuring 4 inches in diameter by 36 inches in length. B-vent pipe is used to exhaust combustion gases from natural gas and propane appliances that draw combustion air from the surrounding space. This type of venting relies on the buoyancy of warm flue gases to create draft, making proper sizing and routing critical to safe operation. The 4ADFC3 is installed by licensed HVAC technicians and gas appliance service professionals in residential and light commercial settings.

This flexible B-vent section is suited for gas furnaces, water heaters, boilers, and other Category I appliances that require Type B double-wall vent connector or main vent runs. Flexible construction allows routing around obstacles and through tight spaces where rigid vent sections are impractical. The 4-inch diameter accommodates mid-range appliance BTU/h outputs typical of residential gas furnaces and water heaters. It is commonly used in retrofit installations or when replacing damaged sections of an existing B-vent system.

Key Features

• Flexible construction allows routing around framing, joists, and other obstructions
• 4-inch diameter suits a wide range of residential Category I gas appliances
• 36-inch length provides a usable section for short runs or connector segments
• Type B double-wall design provides an insulating air gap to maintain flue gas temperature and improve draft
• Compatible with standard B-vent fittings and rigid B-vent components of the same diameter

Compatibility

Designed as an OEM-style replacement or new-installation flexible B-vent section for Category I natural gas and propane appliances requiring 4-inch Type B venting.

Installation Notes

Installation must be performed by a qualified HVAC technician or gas service professional in accordance with the appliance manufacturer instructions, NFPA 54, and all applicable local codes. Shut off gas supply and allow the appliance to cool completely before servicing any vent components. Flexible B-vent must maintain required clearances to combustibles as specified by the manufacturer and local authority having jurisdiction. Do not use B-vent pipe with Category II, III, or IV appliances or with solid-fuel burning equipment.

Technical Specifications

• Diameter: 4 inches
• Length: 36 inches
• Vent Type: Type B Flexible B-Vent

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 4ADFC3