Hart Cooley 3ef B-vent Roof Flange 3 Inches Standard

Product Description

The HART COOLEY 3ef is a standard B-vent roof flange designed for 3-inch Type B double-wall gas vent systems. It seals the point where the vent pipe exits the roof deck, providing a weathertight termination that helps prevent moisture intrusion and maintains proper draft. This flange is rated for use on roofs with a pitch of up to 5/12, covering the most common residential roof slopes encountered on single-family homes and light commercial structures. Licensed HVAC technicians and plumbers install this component as part of natural-draft appliance venting for furnaces, boilers, and water heaters.

This flange is suited for residential and light commercial applications where a 3-inch Type B vent system exhausts a gas-fired appliance through the roof. Typical installations involve natural-draft furnaces, atmospheric water heaters, or boilers venting through conditioned attic space and an insulated roof assembly. It is intended for use on standard-pitch roofs up to 5/12 slope. HVAC and plumbing professionals select this flange when completing a code-compliant B-vent installation terminating above the roofline.

Key Features

• Fits 3-inch Type B double-wall gas vent pipe
• Rated for roof pitches up to 5/12
• Provides weathertight seal at roof penetration
• Lightweight at 1.20 pounds for easy single-person handling on the roof
• Designed for natural-draft gas appliance venting applications

Compatibility

Designed as an OEM-style replacement or new-construction component for 3-inch Type B double-wall gas vent systems installed on roofs with a pitch up to 5/12.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber in accordance with NFPA 54 and the appliance manufacturer instructions. Shut off the gas supply and allow the appliance to cool before working on any connected vent components. The flange should be properly flashed and sealed to the roofing material to ensure a watertight penetration. Verify local code requirements for clearances and termination height above the roof surface before completing the installation.

Technical Specifications

• Vent Size: 3 inches
• Vent Type: Type B Double-Wall Gas Vent
• Maximum Roof Pitch: 5/12
• Weight: 1.20 pounds

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 3ef