Hart Cooley 12rt B-vent Double Wall Round Tee 12 in

Product Description

The HART COOLEY 12rt is a double-wall round tee fitting designed for Type B gas vent systems. It provides a branched connection point in residential or light-commercial venting runs, allowing a secondary appliance or vent line to tie into the main vertical vent stack. The double-wall construction maintains the air-insulating gap required by B-vent standards, helping preserve draft performance and keeping outer surface temperatures within code-acceptable limits. At 12 inches in diameter and 7 pounds, this tee is sized for larger gas appliances and is handled by licensed HVAC or plumbing contractors during vent system installations or retrofits.

This fitting is used in Type B double-wall gas vent applications for natural gas or propane appliances such as furnaces, boilers, and water heaters. It is suited to residential and light-commercial installations where a 12-inch vent diameter is specified. Installers use it when a branch connection is needed in the vertical vent run, typically where a second appliance is being added to an existing venting system or a new multi-appliance manifold is being assembled.

Key Features

• Double-wall round construction maintains required air-insulating gap for Type B vent systems
• 12-inch diameter accommodates larger gas appliances and high-capacity venting runs
• Tee configuration allows branch connections in vertical or horizontal vent assemblies
• Weighs 7 pounds, providing solid build quality for permanent vent installations

Compatibility

Designed as an OEM-style fitting for use in 12-inch Type B double-wall gas vent systems. Consult local mechanical codes and the appliance manufacturer venting requirements to confirm diameter and system compatibility before installation.

Installation Notes

Installation of Type B vent fittings should be performed by a licensed HVAC technician or plumber in accordance with the International Fuel Gas Code (IFGC) and applicable local mechanical codes. Shut off and disconnect all gas appliances connected to the vent system before beginning work, and allow the system to cool completely. Maintain minimum clearances to combustibles as specified on the fitting and in the appliance installation manual. Do not mix B-vent components from different manufacturers within the same vent system unless the components are listed and labeled for such use.

Technical Specifications

• Shape: Round
• Diameter: 12 inches
Weight: 7 pounds

Standard Information

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