Southwark Metal 55NC_4IN Duct Tee End Cap 4 Inch

Product Description

The SOUTHWARK METAL 55NC_4IN is a no-crimp sheet metal duct tee end cap designed to terminate 4-inch diameter round duct tee openings in forced-air HVAC distribution systems. Fabricated from hot-dip galvanized steel, it delivers corrosion resistance suitable for both supply and return duct applications. The no-crimp design allows the cap to slip over the tee opening without requiring a crimped male end, simplifying installation and reducing the need for additional fittings. Licensed HVAC technicians and sheet metal installers use this cap to cap off unused tee branches or to seal a leg of a tee fitting during system layout.

This end cap is suited for residential and light commercial forced-air duct systems where 4-inch round branch runs terminate or are temporarily or permanently closed off. It fits standard 4-inch round duct tee fittings and is appropriate for low-velocity supply or return branch applications. The no-crimp style is commonly used where the mating duct or fitting does not have a crimped end, allowing a clean slip fit connection that is then sealed with approved duct tape or mastic sealant per installation standards.

Key Features

• No-crimp design for slip-fit installation over standard 4-inch round tee openings
• Hot-dip galvanized steel construction for corrosion resistance in duct environments
• Sized for 4-inch diameter round duct tee terminations
• Meets ACCA and SMACNA applicable standards for sheet metal duct fittings
• Suitable for capping unused tee branches in residential and light commercial duct systems

Compatibility

Designed as an OEM-style sheet metal fitting compatible with standard 4-inch round duct tee fittings in residential and light commercial forced-air HVAC systems built to SMACNA and ACCA duct construction standards.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal installer. Power down the air handling unit and ensure the system is depressurized before working on duct branches. Secure the cap over the tee opening and seal all joints with UL 181-listed duct tape or mastic sealant in accordance with SMACNA guidelines and local mechanical codes. Do not leave joints unsealed, as air leakage at tee terminations reduces system efficiency.

Technical Specifications

• Diameter: 4 inches
• Type: No Crimp
• Material: Hot Dip Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 55NC_4IN