Southwark Metal 55NC_6IN Duct Tee End Cap 6 Inch

Product Description

The SOUTHWARK METAL 55NC_6IN is a plain sheet metal duct tee end cap designed to close off the open end of a tee fitting in a forced-air duct system. Constructed from hot dip galvanized steel, this cap delivers corrosion resistance suited to both supply and return air applications. The no-crimp design means the cap slides on without requiring a crimped or beaded end on the branch, simplifying installation in tight spaces. HVAC installers and sheet metal contractors use this cap to cap unused tee legs, balance airflow routing, or terminate branch runs during system balancing.

This end cap is used in residential and light commercial HVAC duct systems where round sheet metal tee fittings are installed. It fits a 6-inch diameter tee branch leg and is appropriate for low-pressure supply or return air duct runs. The plain, no-crimp style is standard in new construction and retrofit installations where duct runs are fabricated or assembled on-site using round spiral or snap-lock duct components.

Key Features

• Hot dip galvanized steel construction provides corrosion resistance for long service life in HVAC duct applications
• No-crimp design eliminates the need for a beaded or crimped fitting end, easing field installation
• Plain end style fits standard 6-inch round duct tee branch openings
• Meets ACCA and SMACNA applicable standards for sheet metal duct fittings
• Suitable for capping unused branch legs during system layout or airflow balancing

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard 6-inch round sheet metal duct tee fittings in residential and light commercial forced-air HVAC systems.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor following SMACNA duct construction standards. Power down the air handling system before accessing duct fittings. Secure the cap with sheet metal screws and seal all joints with listed duct sealant or UL 181-rated tape per local mechanical code requirements. Do not leave duct penetrations unsealed, as air leakage at tee caps reduces system efficiency and may affect pressure balance.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Diameter: 6 inches
• Type: No Crimp
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 55NC_6IN