Metal-fab MF-4D48 Direct Vent Straight Length 48 Inches

Product Description

The METAL-FAB MF-4D48 is a 48-inch straight length section designed for direct vent venting systems. Direct vent pipe routes combustion air and exhaust gases through a sealed, two-pipe assembly, isolating the appliance from indoor air. This section extends a direct vent run between a fuel-fired appliance and its exterior termination point. HVAC technicians and plumbers install this component during new appliance installations or when replacing damaged sections in an existing direct vent system. The 48-inch length suits longer straight runs where shorter sections would require additional joints.

This straight length section is used in residential and light commercial direct vent applications, typically serving gas-fired furnaces, boilers, or water heaters that require a sealed combustion venting system. It connects inline within a direct vent assembly, either horizontally or vertically depending on the appliance manufacturer's venting layout requirements. Consult the appliance manufacturer's installation manual to confirm approved pipe diameter, material, and length configurations before selecting this component.

Key Features

• 48-inch straight length provides extended single-section runs with fewer joints
• Designed for sealed direct vent systems that isolate combustion air from conditioned space
• Suitable for use in residential and light commercial venting assemblies
• METAL-FAB construction consistent with direct vent pipe system standards

Compatibility

Designed as an OEM-style replacement or new-installation component for direct vent pipe systems requiring a 48-inch straight length section. Verify appliance manufacturer specifications for approved pipe diameter and system compatibility before installation.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber in accordance with the appliance manufacturer's instructions and applicable local mechanical codes. Shut off the appliance and allow it to cool completely before servicing any venting components. All direct vent joints must be sealed per the pipe system manufacturer's specifications to maintain a pressure-tight combustion air and exhaust assembly. Do not mix components from different venting system brands or pipe categories without confirming cross-system compatibility.