Hart Cooley 8r3 Type B Vent Round Pipe 8 in X 3 Ft

Product Description

The HART COOLEY 8r3 is a double-wall Type B vent round pipe designed for Category 1 gas appliance venting applications. The pipe features an aluminum inner wall and a galvanized steel outer wall, a construction that provides corrosion resistance on the inside while the outer shell handles structural integrity and heat management. At 8 inches in diameter and 3 feet in length, this section is sized for medium-to-large residential and light commercial gas heating equipment. Licensed HVAC technicians and gas-appliance installers use this pipe to route combustion exhaust safely from Category 1 appliances to the exterior termination point.

Type B vent pipe is used with natural gas and propane appliances classified as Category 1, meaning they operate with non-positive vent pressure and flue gas temperatures that avoid condensation under normal conditions. Typical applications include upflow and counterflow gas furnaces, boilers, and water heaters where the appliance manufacturer specifies Type B venting. The 8-inch diameter suits higher-capacity equipment that requires a larger flue cross-section to maintain proper draft and safe exhaust flow. This pipe section is installed as part of a continuous vent system running from the appliance draft hood collar to the roof cap or wall termination.

Key Features

• Double-wall construction with aluminum inner wall for corrosion resistance against flue gases
• Galvanized outer wall for structural durability and heat dissipation
• 8-inch diameter accommodates higher-capacity Category 1 gas appliances
• 3-foot length provides a standard run section for vent system layout
• Round pipe shape for compatibility with standard Type B vent fittings and collars

Compatibility

Designed for use in Type B vent systems serving Category 1 natural gas and propane appliances, including gas furnaces, boilers, and water heaters that require an 8-inch flue connection and specify Type B double-wall venting.

Installation Notes

Installation must be performed by a licensed HVAC technician or qualified gas-appliance installer in accordance with NFPA 54, the appliance manufacturer instructions, and local mechanical codes. Shut off gas supply and allow the appliance to cool completely before servicing or connecting vent sections. Maintain required clearances to combustibles as specified on the pipe listing label and in applicable code tables. Never mix Type B vent components from different manufacturers within the same vent system unless the manufacturer explicitly lists that combination.

Technical Specifications

• Vent Type: Type B Double-Wall
• Category: Category 1
• Pipe Shape: Round
• Diameter: 8 inches
• Length: 36 inches (3 feet)
• Inner Material: Aluminum
• Outer Material: Galvanized Steel
• Weight: 8 pounds

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 8r3