Hart Cooley 12r3 Type B Vent Round Pipe 12 in X 3 Ft

Product Description

The HART COOLEY 12r3 is a double-wall Type B vent round pipe designed for Category 1 gas appliance venting applications. The pipe measures 12 inches in diameter and 3 feet in length, featuring an aluminum inner wall and a galvanized steel outer wall. This construction provides the thermal separation required for safe draft in natural-draft and fan-assisted gas appliances operating at negative or neutral static pressure. HVAC technicians and plumbers install this pipe as part of listed B-vent systems in residential and light commercial settings. At 11.90 pounds per section, it is manageable for single-technician handling during overhead or vertical runs.

This pipe section is used in vertical and offset vent systems serving Category 1 gas appliances such as natural-draft furnaces, boilers, and water heaters. The double-wall design maintains flue gas temperature to sustain proper draft while keeping the outer surface cooler for reduced clearance-to-combustibles requirements as specified by the manufacturer listing. It is suited for new installations and replacement runs where the existing system uses listed Type B vent components of the same diameter series.

Key Features

• Double-wall construction with aluminum inner wall for corrosion resistance against acidic condensate
• Galvanized steel outer wall for structural rigidity and durability in attic and chase installations
• 12-inch diameter accommodates high-capacity Category 1 appliance venting requirements
• 3-foot section length reduces the number of joints needed in longer vertical runs
• Listed for Category 1 venting — negative or neutral static pressure, low-temperature flue gas

Compatibility

Designed as an OEM-style Type B vent section for use in listed double-wall B-vent systems serving Category 1 gas appliances with a 12-inch vent connector diameter.

Installation Notes

Type B vent pipe must be installed by a qualified HVAC technician or plumber in accordance with the appliance manufacturer instructions, NFPA 54 (National Fuel Gas Code), and applicable local mechanical codes. Shut off the gas supply and allow the appliance and existing vent components to cool completely before beginning any vent system work. All sections must be from the same listed vent system series and diameter to maintain the listing — do not mix vent diameters or manufacturer systems within a single vent run. Maintain required clearances to combustibles as stated in the vent system listing documentation.

Technical Specifications

• Vent Type: Type B Double Wall
• Vent Category: Category 1
• Pipe Shape: Round
• Diameter: 12 inches
• Length: 3 feet (36 inches)
• Inner Wall Material: Aluminum
• Outer Wall Material: Galvanized Steel
• Weight: 11.90 pounds

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 12r3