Metal-fab 4M-KIT 4 Inch Vertical Vent Kit

Product Description

The METAL-FAB 4M-KIT is a complete vertical vent kit designed for routing flue gases from gas-fired appliances through a standard roof penetration. The kit provides all the major components needed for a single-wall vertical vent run, including straight pipe sections, elbows, roof flashing rated for pitches up to 5/12, a storm collar, and a vent cap. Licensed HVAC technicians and plumbers install this type of kit on residential and light commercial gas appliances where a new or replacement vertical vent stack is required. The 4-inch nominal diameter makes it suited for smaller BTU input appliances that specify 4-inch single-wall vent pipe.

This kit is intended for vertical vent installations where the vent terminates through the roof. The included components cover a typical straight-up vent run with offset capability from the three 90-degree elbows and the adjustable pipe section. The standard roof flashing accommodates roof pitches up to 5/12. The storm collar and vent cap work together to prevent weather infiltration at the roof termination point. This kit is appropriate for residential gas furnaces, water heaters, boilers, and similar appliances that specify 4-inch single-wall metal vent pipe.

Key Features

• Complete kit includes all major vertical vent components for a single installation
• Four pipe sections total: two 2-foot lengths, one 1-foot length, and one 1-foot adjustable length
• Three 90-degree elbows (4M90) allow routing flexibility within the vent run
• Standard roof flashing (4MF) rated for roof pitches up to 5/12
• Storm collar (4MSC) and vent cap (4MCHP) provide weather-tight roof termination
• 4-inch nominal diameter fits appliances specifying 4-inch single-wall vent pipe

Compatibility

Designed as an OEM-style replacement or new-installation kit for residential and light commercial gas appliances specifying 4-inch single-wall metal vent pipe.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber in accordance with the appliance manufacturer instructions and applicable local mechanical codes such as the IFGC. Shut off the gas supply and allow the appliance to cool completely before beginning any vent work. Ensure all pipe joints are properly secured and that the storm collar is sealed to the roof deck to prevent water infiltration. Roof flashing must be correctly integrated with roofing materials to maintain a watertight penetration.

Technical Specifications

• Nominal Diameter: 4 inches
• Vent Orientation: Vertical
• Roof Flashing Pitch Rating: Up to 5/12 pitch
• Kit Components: 2x 4M24 2 ft pipe, 1x 4M12 1 ft pipe, 1x 4M12A 1 ft adjustable pipe, 3x 4M90 90-degree elbows, 1x 4MF roof flashing, 1x 4MSC storm collar, 1x 4MCHP vent cap

Standard Information

• Brand: METAL-FAB
• Manufacturer Part Number: 4M-KIT