Southwark Metal WS21_3-1/4X10 Wall Stack End Cap

Product Description

The SOUTHWARK METAL WS21_3-1/4X10 is a sheet metal wall stack end cap sized at 3-1/4 inches by 10 inches, fabricated from hot dip galvanized steel. It is designed to close off the open end of a wall stack duct register boot, preventing air bypass and maintaining system pressure at the terminal point of a supply duct run. This part is installed in residential forced-air HVAC systems where space constraints require a wall stack configuration. HVAC installers and sheet metal contractors work with this component during new construction rough-in or duct replacement projects.

Wall stack end caps are used in residential HVAC duct systems where supply air is delivered through narrow vertical cavities in interior walls. This cap fits standard 3-1/4 inch by 10 inch wall stack duct openings, which are common in single-family and multi-family residential construction. It is typically installed at the end of a wall stack run where no register boot is present, sealing the duct termination point. The galvanized steel construction meets the durability expectations of both new construction and retrofit applications.

Key Features

• Hot dip galvanized steel construction resists corrosion in concealed wall cavity installations
• Fits standard 3-1/4 inch by 10 inch wall stack duct openings
• Seals open duct ends to prevent air bypass and maintain system static pressure
• Meets ACCA and SMACNA applicable standards for sheet metal ductwork
• Suitable for residential forced-air supply duct systems

Compatibility

Designed as an OEM-style replacement and new-construction component for standard 3-1/4 inch by 10 inch wall stack duct systems in residential forced-air HVAC applications.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor. Power down the air handling unit and lock out the system before working inside duct cavities. Secure the end cap according to SMACNA sheet metal installation guidelines, using appropriate fasteners and duct sealant to maintain airtight closure. Verify the cap seats flush against the duct opening before restoring system operation.

Technical Specifications

• Size: 3-1/4 inches x 10 inches
• Material: Hot Dip Galvanized Steel
• Type: Wall Stack End Cap
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: WS21_3-1/4X10