Metal-fab 3mcuhp B-vent Universal Vent Cap 3 Inches

Product Description

The METAL-FAB 3mcuhp is a universal round vent cap designed for Type B gas vent pipe systems. It terminates the vent stack at the roof or exterior wall, protecting the flue opening from weather intrusion, downdrafts, and debris while allowing combustion gases to exhaust freely. The inner wall is constructed from aluminum alloy at 0.012 inches thick, and the outer wall is G90 galvanized steel at 0.018 inches thick. With an overall height of 8.375 inches, this cap meets UL 441, CUL, and NFPA 54/211 standards. Licensed HVAC technicians and gas appliance installers handle this component as part of a complete B-vent termination assembly.

This vent cap is suited for residential and light commercial gas appliance venting applications where a 3-inch Type B double-wall vent system is in use. Typical installations include natural gas furnaces, water heaters, boilers, and other Category I appliances vented through B-vent pipe routed to the exterior. The universal round design accommodates standard termination points in single-story and multi-story structures.

Key Features

• Universal round cap design compatible with 3-inch Type B gas vent pipe systems
• Aluminum alloy inner wall at 0.012 inches for corrosion resistance against flue gases
• G90 galvanized steel outer wall at 0.018 inches for exterior weather durability
• Meets UL 441, CUL, and NFPA 54/211 applicable standards
• Overall height of 8.375 inches for proper termination clearance
• Backed by a 1-year limited warranty

Compatibility

Designed as an OEM-style replacement or new-installation termination cap for 3-inch Type B double-wall gas vent pipe systems.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified gas appliance installer in accordance with NFPA 54 and the appliance manufacturer instructions. Shut off the gas supply and allow the vent system to cool completely before removing or replacing any vent components. Follow local building codes and the International Fuel Gas Code (IFGC) for required termination height clearances above the roof surface and adjacent structures. Do not substitute this cap on vent systems with pipe diameters other than 3 inches.

Technical Specifications

• Type: Universal Round Gas Vent Pipe Cap
• Size: 3 inches
• Overall Height: 8.375 inches
• Inner Wall Material: Aluminum Alloy
• Inner Wall Thickness: 0.012 inches
• Outer Wall Material: G90 Galvanized Steel
• Outer Wall Thickness: 0.018 inches
• Applicable Standards: UL 441, CUL, NFPA 54/211
• Warranty: 1 Year Limited

Standard Information

• Brand: METAL-FAB
• Manufacturer Part Number: 3mcuhp