Lukjan rx1004 Metal Tab Collar 4 Inches Hvac Duct

Product Description

The LUKJAN rx1004 is a short metal tab collar designed to create secure, low-leakage connections in HVAC ductwork systems. Manufactured by Lukjan Metal Products, this collar measures 4 inches in diameter and features a crimped profile that locks into adjoining duct sections or fittings. The tab design holds the collar firmly in place during assembly, reducing air bypass and maintaining system static pressure. Built from corrosion-resistant metal, the rx1004 is suited for long-service-life installations in both residential and light commercial forced-air systems. HVAC installers and sheet metal mechanics rely on this type of collar for duct transitions, trunk takeoffs, and branch connections where a tight, repeatable fit is required.

The rx1004 is used in forced-air heating and cooling ductwork where a 4-inch collar connection is needed. Typical applications include supply and return branch takeoffs from main trunk lines, connections to flexible duct, and transitions between rigid duct sections. The short collar profile suits installations with limited clearance or where a compact fitting is preferred. It is appropriate for residential new construction, renovation work, and commercial tenant improvement projects that use standard round duct systems.

Key Features

• 4-inch diameter fits standard round duct and flex duct connections
• Crimped end profile locks into mating duct sections for a secure fit
• Tab design simplifies alignment and speeds installation
• Corrosion-resistant metal construction for long service life
• Short collar body suits tight-clearance installation locations
• Minimizes air leakage at duct joints to support system efficiency

Compatibility

Designed as an OEM-style replacement and new-installation fitting for standard 4-inch round HVAC duct systems in residential and light commercial forced-air applications.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal mechanic. Power down the air handling unit and verify the system is de-energized before working on ductwork. Secure the collar with sheet metal screws and seal all joints with listed duct mastic or UL 181-rated tape per local mechanical code requirements. Do not overtighten fasteners, as this may deform the collar and compromise the seal.