Hart Cooley 4rp4 B-vent Round Pipe 4 Inches X 4 Feet

Product Description

The HART COOLEY 4rp4 is a round B-vent gas vent pipe designed for venting Category I gas appliances such as furnaces, boilers, and water heaters. Nominal diameter is 4 inches with a listed length of 4 feet. The outside diameter for a 4-inch nominal pipe measures 4.5 inches (size plus 0.5 inches per the manufacturer sizing convention). When two sections are joined, the coupler overlap is 1.375 inches, so the assembled length is 1.375 inches less than the listed length. Minimum clearance to combustibles is 1 inch. This pipe is handled and installed by licensed HVAC and mechanical contractors performing gas appliance venting work.

The 4rp4 is used in residential and light-commercial B-vent gas venting systems. It is appropriate for venting naturally drafting gas appliances where Type B double-wall vent pipe is required by code. Typical installations route sections vertically through interior wall cavities, attics, and chases. Multiple sections connect end-to-end to build out required vent runs, combined with elbows, tees, caps, and supports from the same B-vent system.

Key Features

• 4-inch nominal diameter with 4.5-inch outside diameter per manufacturer sizing standard
• Listed length of 4 feet; assembled length is 1.375 inches shorter due to coupler overlap when joined
• 1-inch minimum clearance to combustibles required during installation
• Designed for Type B gas vent applications on Category I naturally drafting gas appliances
• Full installation instructions supplied with caps and supports in the system

Compatibility

Designed as an OEM-style component for Type B round gas vent systems using 4-inch nominal diameter pipe and fittings. Couplers overlap 1.375 inches when joined to adjacent sections or fittings within the same B-vent product family.

Installation Notes

Installation must be performed by a qualified HVAC or mechanical contractor in accordance with NFPA 54, the National Fuel Gas Code, and all applicable local codes. Shut off the gas supply and allow the appliance to cool completely before servicing or extending the vent system. Maintain the required 1-inch minimum clearance to combustibles at all points along the vent run. Follow the manufacturer-supplied installation instructions included with caps and supports for proper support spacing and termination requirements.

Technical Specifications

• Nominal Diameter: 4 inches
• Outside Diameter: 4.5 inches
• Listed Length: 4 feet
• Coupler Overlap: 1.375 inches
• Minimum Clearance to Combustibles: 1 inch
• Vent Type: Type B Round Gas Vent
• Unit of Measure: Each

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 4rp4