Metal-fab MF-5DWT Direct Vent Wall Thimble

Product Description

The METAL-FAB MF-5DWT is a direct vent wall thimble designed to provide a safe passage for direct vent piping systems through exterior walls. Wall thimbles serve as the critical transition point where the vent pipe exits the building envelope, maintaining proper clearances and protecting combustible wall materials from heat exposure. This component is a standard installation part for licensed HVAC technicians and gas appliance installers working on direct vent heating equipment such as furnaces, boilers, and water heaters.

The MF-5DWT is suited for residential and light commercial direct vent installations where the vent terminal passes horizontally through an exterior wall. It is used in new construction and retrofit applications to meet code-required clearances between the vent pipe and surrounding wall framing or insulation. Installers select wall thimbles based on vent pipe diameter and wall construction type, so verify system requirements before installation.

Key Features

• Designed for direct vent wall penetration applications
• Maintains required clearances between vent pipe and combustible wall materials
• Suitable for horizontal through-wall vent termination installations
• Manufactured by METAL-FAB, a recognized name in venting system components

Compatibility

Designed as an OEM-style replacement or new-installation component for direct vent piping systems requiring a wall thimble at the exterior wall termination point.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified gas appliance installer in accordance with the International Fuel Gas Code (IFGC) and the appliance manufacturer's venting instructions. Shut off and lock out the gas supply and power to the appliance before beginning any venting work. Ensure the thimble is sized correctly for the vent pipe diameter and that all required clearances to combustible materials are maintained per local code. Do not modify the thimble or use it with vent pipe diameters or system types for which it is not rated.