Hart Cooley 7r4 Type B Vent Pipe 7 Inch 4 Ft Double Wall

Product Description

The HART COOLEY 7r4 is a double-wall Type B vent round pipe designed for Category 1 gas appliance venting applications. Constructed with an aluminum inner wall and a galvanized steel outer wall, this 7-inch diameter pipe measures 4 feet in length. The double-wall design creates an insulating air space between the two walls, which helps maintain flue gas temperatures and reduce heat transfer to combustible surroundings. Licensed HVAC technicians and plumbers install this pipe as part of listed B-vent vent systems on natural gas and propane appliances that produce non-positive vent pressure and flue gas temperatures that do not exceed Category 1 limits.

This pipe is used in residential and light commercial installations where Category 1 gas appliances require a listed Type B vent system. Typical applications include upflow and counterflow gas furnaces, gas water heaters, and other Category 1 rated gas appliances vented vertically through conditioned or semi-conditioned spaces. The 7-inch diameter accommodates higher-capacity appliances or combined common-vent configurations. The 4-foot section length suits straight vertical runs between fittings or offsets within a complete B-vent assembly.

Key Features

• Double-wall construction with aluminum inner liner and galvanized outer wall for durability and thermal performance
• 7-inch nominal diameter suited for higher-capacity Category 1 gas appliance venting
• 4-foot section length for efficient straight-run installation
• Listed for Category 1 venting where flue gases are non-positive pressure and non-condensing
• Air space between walls reduces surface temperature and protects nearby combustibles

Compatibility

Designed as an OEM-style listed Type B vent component for use in Category 1 residential and light commercial gas appliance vent systems requiring 7-inch diameter double-wall round pipe.

Installation Notes

Type B vent systems must be installed by a qualified HVAC technician or plumber in accordance with the appliance manufacturer instructions, the vent system listing, NFPA 54 National Fuel Gas Code, and applicable local mechanical codes. Shut off the gas supply and allow the appliance to cool completely before servicing or extending an existing vent system. Maintain all required clearances to combustibles as specified by the vent system listing and local authority having jurisdiction. Do not mix Type B vent components from different manufacturers within the same listed vent system unless explicitly permitted by the listing.

Technical Specifications

• Vent Type: Type B Double Wall
• Vent Category: Category 1
• Diameter: 7 inches
• Length: 48 inches (4 feet)
• Inner Wall Material: Aluminum
• Outer Wall Material: Galvanized Steel
• Shape: Round

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 7r4