Southwark Metal 28_3-1/4X10X7 Wall Stack End Boot

Product Description

The SOUTHWARK METAL 28_3-1/4X10X7 is a sheet metal duct wall stack end boot designed to transition a rectangular wall stack opening to a round collar for residential and light commercial forced-air distribution systems. Constructed from hot dip galvanized steel, it provides corrosion resistance suited to long-term HVAC duct installations. The inlet measures 3.25 inches by 10 inches, and the outlet is a 7-inch diameter round collar. HVAC sheet metal contractors and duct installers use this fitting to complete low-profile wall stack runs that terminate at floor registers or wall grilles.

This end boot fits wall stack duct applications where a rectangular plenum or extended stack transitions to a round duct connection at the terminal end. It is commonly installed in residential new construction and retrofit projects where wall cavity space limits duct depth. The fitting suits forced-air heating and cooling systems that use 3.25-inch by 10-inch wall stack duct as part of the supply distribution layout. Installation is performed by licensed HVAC technicians or sheet metal workers following SMACNA and ACCA duct construction standards.

Key Features

• Hot dip galvanized steel construction for corrosion resistance in HVAC duct systems
• Rectangular inlet of 3.25 inches by 10 inches matches standard wall stack duct sizing
• 7-inch diameter round outlet for transition to round collar or register boot connection
• Fabricated to SMACNA and ACCA applicable standards for sheet metal duct fittings
• Wall stack end boot configuration suited for low-profile cavity installations

Compatibility

Designed as an OEM-style replacement and standard fitting for residential and light commercial forced-air duct systems using 3.25-inch by 10-inch wall stack duct with a 7-inch round outlet connection.

Installation Notes

Installation is performed by a licensed HVAC technician or certified sheet metal worker. Shut down the air handling system and de-energize the unit before beginning any duct work. Secure the fitting with sheet metal screws and seal all joints with UL-listed duct sealant or metal-backed tape in accordance with SMACNA duct construction standards. Do not use duct tape that does not meet UL 181 requirements.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Inlet Size (Size A): 3.25 inches x 10 inches
• Outlet Size (Size B): 7 inches diameter
• Type: Wall Stack End Boot
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 28_3-1/4X10X7