Southwark Metal 28_3-1/4X14X7 Duct Wallstack End Boot

Product Description

The SOUTHWARK METAL 28_3-1/4X14W14X7 is a sheet metal duct wallstack end boot designed to transition a rectangular wall stack opening to a round duct connection. Constructed from hot-dipped galvanized steel, it provides corrosion resistance suitable for residential and light commercial HVAC duct systems. The rectangular inlet measures 3-1/4 inches by 14 inches, and the round outlet measures 7 inches in diameter. This fitting is installed by licensed HVAC technicians and sheet metal contractors as part of a forced-air distribution system, typically at the wall stack termination point where duct transitions to a register boot or collar.

This end boot is used in residential forced-air heating and cooling systems where a wall stack feeds a floor, wall, or ceiling register. It fits applications where the supply trunk or stack runs in a confined wall cavity and requires a rectangular-to-round transition at the outlet. The 3-1/4 x 14 inch face is a standard wallstack dimension, making this a common replacement or new-construction fitting in residential HVAC ducting layouts built to ACCA and SMACNA standards.

Key Features

• Hot-dipped galvanized steel construction for corrosion resistance in conditioned and unconditioned spaces
• Rectangular inlet: 3-1/4 inches by 14 inches to match standard wall stack openings
• Round outlet: 7 inches in diameter for connection to round duct or collar fittings
• Rectangular-to-round transition geometry reduces turbulence at the stack termination
• Fabricated to ACCA and SMACNA applicable standards

Compatibility

Designed as an OEM-style sheet metal fitting for residential and light commercial forced-air duct systems using standard 3-1/4 x 14 inch wall stack configurations with a 7-inch round outlet connection.

Installation Notes

Installation is performed by licensed HVAC technicians or sheet metal contractors. Power down the air handling unit and close the system dampers before fitting installation. Secure the boot to the stack and round duct using sheet metal screws and seal all joints with UL 181-rated mastic or foil tape per SMACNA ductwork installation guidelines. Do not compress or distort the fitting during installation, as deformation will affect airflow and register seating.

Technical Specifications

• Material: Hot Dipped Galvanized Steel
• Rectangular Inlet (Size A): 3-1/4 inches x 14 inches
• Round Outlet (Size B): 7 inches diameter
• Type: Stack, Rectangular to Round
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 28_3-1/4X14X7