Southwark Metal 28_3-1/4X12X6 Duct Wall Stack End Boot

Product Description

The SOUTHWARK METAL 28_3-1/4X12X6 is a rectangular-to-round sheet metal duct end boot designed for wall stack duct terminations in residential and light commercial HVAC systems. It transitions from a 3.25 inch by 12 inch rectangular duct opening to a 6 inch round collar, making it a standard fitting for floor or wall stack installations where space between joists or studs limits duct depth. Fabricated from hot dipped galvanized steel, this boot resists corrosion in both conditioned and unconditioned spaces. HVAC installers and sheet metal fabricators use it as a functional termination point connecting the supply trunk to floor or wall register boots. It meets ACCA and SMACNA applicable standards for residential forced-air duct systems.

This end boot is suited for new construction and retrofit applications where a wall stack supply outlet is required. The 3.25 inch throat dimension fits within standard framing cavities, and the 6 inch round collar accepts standard round duct or flexible duct connections. Typical installation scenarios include single-family residential forced-air systems where low-profile duct routing through interior walls or floor cavities is required. HVAC sheet metal contractors use this fitting during rough-in to complete the supply side of a forced-air distribution system.

Key Features

• Rectangular-to-round transition from 3.25 x 12 inches to a 6 inch round collar
• Hot dipped galvanized steel construction for corrosion resistance
• Wall stack configuration fits standard framing cavities
• Meets ACCA and SMACNA applicable duct fabrication standards
• Compatible with standard 6 inch round duct or flexible duct connections

Compatibility

Designed as an OEM-style replacement and new-construction fitting for residential and light commercial forced-air supply duct systems requiring a rectangular wall stack to 6 inch round end boot transition.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor. Shut down and lock out the air handler or furnace before making any duct connections. Secure the boot to the duct stack with sheet metal screws and seal all joints with UL 181-rated mastic or foil tape in accordance with SMACNA duct construction standards. Avoid over-driving screws through the galvanized surface in areas that may be exposed to moisture.

Technical Specifications

• Material: Hot Dipped Galvanized Steel
• Size A (Rectangular Opening): 3.25 inches x 12 inches
• Size B (Round Collar Diameter): 6 inches
• Type: Stack, Rectangular to Round End Boot
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 28_3-1/4X12X6