Hart Cooley 6ef12 Steep Roof Flange 6 Inch B-vent

Product Description

The HART COOLEY 6ef12 is a steep roof flange designed for 6-inch B-vent systems installed on roofs with pitches ranging from 6/12 to 12/12. This sheet metal flange creates a weathertight seal where the B-vent chimney pipe penetrates the roof deck, keeping moisture out and maintaining proper vent alignment. It is a standard component in gas appliance venting systems — furnaces, water heaters, and boilers — that rely on Type B double-wall vent pipe. HVAC technicians and plumbers install this flange during new construction or when replacing deteriorated roof penetration hardware on steep-pitch residential roofs.

This flange is suited for residential applications where the roof pitch falls in the 6/12 to 12/12 range, which covers most standard steep-slope roofs. It pairs with 6-inch B-vent pipe and is typically installed during the rough-in phase or as a service replacement when an existing flange shows rust, cracking, or failed sealing. Installers working on natural gas or propane venting systems will find this flange compatible with standard B-vent roof termination assemblies.

Key Features

• Fits 6-inch diameter B-vent pipe
• Compatible with steep roof pitches from 6/12 to 12/12
• Provides weathertight roof penetration for gas appliance venting
• Lightweight at 2.70 pounds for ease of handling on the roof

Compatibility

Designed as an OEM-style replacement steep roof flange for 6-inch Type B double-wall vent systems on residential gas appliances with roof pitches between 6/12 and 12/12.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber in accordance with NFPA 54 and local mechanical codes governing gas appliance venting. Shut down and allow the connected gas appliance to cool completely before disturbing any vent components. The flange should be properly flashed and sealed against the roof deck using compatible roofing materials to prevent water intrusion. Do not modify the flange opening or compress the vent pipe clearances required by the B-vent manufacturer.

Technical Specifications

• Size: 6 inches
• Vent Type: B-Vent
• Roof Pitch Range: 6/12 to 12/12
• Weight: 2.70 pounds

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 6ef12