Metal-fab MF-4DAL Direct Vent Variable Length Pipe

Product Description

The METAL-FAB MF-4DAL is a direct vent variable length pipe section designed for sealed combustion venting systems. It adjusts from 3 inches to 10 inches to accommodate field conditions during installation, reducing the need for field cuts on standard pipe runs. This fitting is used by HVAC technicians and plumbers working on direct vent appliances such as gas furnaces, boilers, and water heaters that require a sealed, two-pipe venting configuration. The adjustable length simplifies rough-in situations where fixed-length pipe sections would require trimming or additional couplings.

This adjustable pipe section is suited for residential and light commercial direct vent installations. It fits into venting runs where minor length variations exist between appliances and wall or ceiling penetration points. Installers use it to fine-tune pipe runs without cutting fixed-length sections, saving time on the job. It is appropriate for use in new construction and retrofit applications where direct vent, sealed combustion appliances are being connected to coaxial or parallel pipe vent systems.

Key Features

• Adjustable length from 3 inches to 10 inches for flexible field fitting
• Designed for direct vent, sealed combustion venting systems
• Eliminates the need to cut fixed-length pipe sections in short runs
• Compatible with coaxial and parallel direct vent pipe configurations
• Suitable for residential and light commercial HVAC and plumbing applications

Compatibility

Designed as an OEM-style replacement and new-installation component for direct vent sealed combustion venting systems. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber in accordance with the appliance manufacturer instructions and applicable codes such as the IFGC and ANSI standards for venting. Shut off and lock out the appliance before making any modifications to the vent system. Verify all joints are fully seated and sealed per the vent system manufacturer requirements before restoring power or gas. Do not exceed the maximum or minimum adjustment range of the fitting during installation.