Hart Cooley 12r18a B-vent Adjustable Round Pipe

Product Description

The HART COOLEY 12r18a is a round adjustable B-vent pipe section used in Type B gas vent systems for residential and light commercial heating appliances. Measuring 12 inches in diameter and 18 inches in length, this pipe section adjusts from 3 inches to 16 inches to accommodate variable clearances during installation. At 6.25 pounds, it is manageable for single-tech handling. HVAC technicians and plumbers install this fitting when connecting gas-fired furnaces, boilers, or water heaters to vertical B-vent flue systems requiring length flexibility at the appliance collar or between sections.

This adjustable pipe section is intended for use in Type B double-wall vent assemblies serving natural gas and propane appliances. The adjustable design is particularly useful in retrofit and replacement scenarios where the fixed section lengths of a standard vent kit do not line up with existing offsets or appliance flue collars. It is suitable for residential gas furnaces, atmospheric water heaters, and other Category I appliances vented vertically through interior chases.

Key Features

• Adjustable length from 3 inches to 16 inches within an 18-inch overall section
• 12-inch diameter suits large-capacity heating appliances
• Round pipe shape for standard Type B vent system compatibility
• Lightweight at 6.25 pounds for easier single-tech handling on ladders or in tight chases
• Designed for retrofit and new-construction B-vent installations requiring length flexibility

Compatibility

Designed as an OEM-style replacement or new-installation component for 12-inch Type B double-wall round vent systems on residential and light commercial gas-fired appliances.

Installation Notes

Installation of B-vent components must be performed by a licensed HVAC technician or plumber in accordance with NFPA 54 and the appliance manufacturer instructions. Always shut down and allow the appliance and existing vent sections to cool completely before disassembling or extending the vent run. Maintain required clearances to combustibles as specified by local codes and the vent system manufacturer. Do not use Type B vent components in applications requiring positive-pressure or direct-vent flue systems.

Technical Specifications

• Diameter: 12 inches
• Length: 18 inches
• Adjustable Range: 3 inches to 16 inches
• Pipe Shape: Round
• Weight: 6.25 pounds

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 12r18a