Southwark Metal WS21_3-1/4X12 Wall Stack End Cap

Product Description

The SOUTHWARK METAL WS21_3-1/4X12 is a sheet metal wall stack end cap designed to close off the open end of a 3.25 x 12 inch wall stack duct assembly. Fabricated from hot dip galvanized steel, it provides corrosion resistance suited to residential and light commercial duct installations. This end cap terminates the duct run cleanly, preventing air bypass and maintaining system static pressure at the wall stack outlet. HVAC sheet metal contractors and mechanical installers fit this component during new construction and duct renovation work where wall stack supply systems are used.

Wall stack duct systems route conditioned air vertically through interior partition cavities, delivering supply air at floor or baseboard registers. This end cap is used at the closed terminal end of the wall stack to seal the duct and direct all airflow to the intended register outlet. It is a standard component in residential forced-air heating and cooling systems where space constraints favor thin, rectangular duct profiles inside wall cavities. Fabrication and installation conform to ACCA and SMACNA standards for residential and light commercial sheet metal ductwork.

Key Features

• Hot dip galvanized steel construction resists corrosion in concealed wall cavity applications
• Sized at 3.25 x 12 inches to fit standard residential wall stack duct openings
• Closes off the terminal end of a wall stack duct run to eliminate air bypass
• Manufactured to ACCA and SMACNA applicable standards for sheet metal ductwork
• Compatible with wall stack duct assemblies used in thin-cavity forced-air systems

Compatibility

Designed as an OEM-style replacement and new-construction component for 3.25 x 12 inch wall stack duct systems installed per ACCA and SMACNA sheet metal standards.

Installation Notes

Installation is performed by licensed sheet metal contractors or HVAC mechanics working with low-pressure residential duct systems. Shut down the air handler and relieve system pressure before modifying any duct section. Secure the end cap to the wall stack using sheet metal screws or approved duct fasteners per SMACNA installation guidelines. Seal all joints with listed duct sealant or mastic to maintain system air tightness.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Size: 3.25 x 12 inches
• Type: Wall Stack End Cap
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: WS21_3-1/4X12