Southwark Metal 55_12IN Duct Tee End Cap 12 Inch

Product Description

The SOUTHWARK METAL 55_12IN is a 12-inch diameter sheet metal duct tee end cap designed to terminate open tee branches in forced-air duct systems. Constructed from hot dip galvanized steel, this cap provides corrosion resistance suited to both supply and return air applications. The crimped end design allows it to slip over the branch opening of a standard round duct tee fitting, creating a clean, secure closure. HVAC installers use this cap when a tee branch is not connected to a downstream run and must be sealed off to maintain system static pressure and airflow balance. The galvanized finish meets the durability expectations of residential and light commercial ductwork environments.

This tee end cap is used in residential and light commercial HVAC duct installations wherever a round sheet metal tee branch requires capping. Typical scenarios include partially staged system layouts, unused branch takeoffs, and duct modifications where a branch has been decommissioned. It is installed as part of low-pressure supply or return air duct assemblies fabricated from round sheet metal fittings. Fabricators and sheet metal installers working to SMACNA and ACCA standards will find this fitting consistent with those guidelines.

Key Features

• 12-inch diameter fits standard round duct tee branch openings
• Hot dip galvanized steel construction provides corrosion resistance for long service life
• Crimped end design seats over the tee branch opening for a snug mechanical fit
• Manufactured to ACCA and SMACNA applicable standards
• Suitable for low-pressure residential and light commercial forced-air duct systems

Compatibility

Designed as an OEM-style sheet metal fitting for use with standard 12-inch diameter round duct tee fittings in residential and light commercial forced-air HVAC systems fabricated to SMACNA and ACCA standards.

Installation Notes

Installation is performed by licensed sheet metal workers or HVAC technicians as part of duct fabrication or modification work. Power down the air handling unit and ensure the system is depressurized before capping or modifying duct branches. Secure the cap with sheet metal screws and seal all joints with UL 181-listed duct tape or mastic sealant per SMACNA guidelines to prevent air leakage. Follow local mechanical codes for duct construction and sealing requirements.

Technical Specifications

• Diameter: 12 inches
• Material: Hot Dip Galvanized Steel
• End Type: Crimped
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 55_12IN