Hart Cooley 7r3 Type B Vent Round Pipe 7 in 3 Ft

Product Description

The HART COOLEY 7r3 is a double-wall Type B vent round pipe designed for Category 1 gas appliance venting applications. Measuring 7 inches in diameter and 3 feet in length, it features an aluminum inner wall and a galvanized steel outer wall. This construction maintains the air gap required by Type B vent standards, which helps protect combustible clearances while managing flue gas temperatures. Licensed HVAC technicians and plumbers install this pipe as part of vented gas appliance systems in both new construction and replacement scenarios.

This pipe is used in Category 1 gas appliance venting systems, which include natural gas and propane furnaces, boilers, and water heaters that operate with non-positive vent pressure and flue gas temperatures that avoid excessive condensation. The 7-inch diameter suits mid-to-large capacity residential and light commercial appliances. It is installed vertically or at manufacturer-approved angles as part of a continuous B-vent system routed from the appliance draft hood to the terminal cap above the roofline.

Key Features

• Double-wall construction with aluminum inner wall and galvanized outer wall for Category 1 venting compliance
• 7-inch diameter accommodates mid-to-large capacity gas appliance vent connections
• 3-foot section length reduces the number of joints needed in longer vent runs
• Round pipe shape provides consistent airflow and straightforward fitting connections
• Aluminum inner wall resists corrosion from flue gas condensate

Compatibility

Designed as an OEM-style replacement and new-installation component for Category 1 double-wall Type B vent systems requiring 7-inch diameter round pipe sections.

Installation Notes

Installation must be performed by a qualified HVAC technician or plumber in accordance with NFPA 54, the International Fuel Gas Code (IFGC), and local jurisdiction requirements. Always shut off gas supply and allow the appliance to cool completely before servicing or modifying any vent system. Maintain required clearances to combustibles as specified by the vent system manufacturer and applicable codes. Do not mix Type B vent components from different manufacturers within the same vent run unless the system is listed and approved for mixed use.

Technical Specifications

• Vent Type: Type B Double Wall
• Vent Category: Category 1
• Diameter: 7 inches
• Length: 3 feet
• Pipe Shape: Round
• Inner Wall Material: Aluminum
• Outer Wall Material: Galvanized Steel
• Weight: 7.38 pounds

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 7r3