Lukjan TO3606 Rectangular-to-Round Side Takeoff – 6 Inch Diameter

The Lukjan TO3606 Rectangular-to-Round Side Takeoff is a precision-formed duct fitting engineered for HVAC system transitions between rectangular trunk ducts and round branch runs. Constructed from galvanized steel, this takeoff provides a mechanically robust and dimensionally consistent connection that supports efficient airflow distribution and system integrity in both residential and commercial air distribution networks. The side configuration allows for streamlined branch connections while maintaining optimal duct geometry and minimal pressure drop across the system.

Details

• Manufacturer: Lukjan Metal Products
• Model Number: TO3606
• Product Type: Rectangular-to-Round Side Takeoff
• Series: T19
• Configuration: Straight Side Takeoff
• Round Outlet Diameter: 6 inches (152.4 mm)
• Rectangular Base Width: 6 inches (152.4 mm)
• Length: 8 inches (203.2 mm)
• Material: Galvanized Steel
• Gauge: 26–30 GA typical (per duct specification)
• Connection Type: Rectangular collar to round outlet transition
• Orientation: Side-mounted (straight side takeoff)
• Shape: Rectangular-to-round transition
• End Treatment: Raw ends suitable for drive slip or S-cleat connections
• Surface Finish: Mill-galvanized coating for corrosion resistance
• Temperature Range: Rated for standard HVAC service conditions
• Application Type: Supply and return air branch connections
• Compliance: SMACNA and ASTM A653 standards for duct construction
• Usage: Compatible with sheet metal duct systems for forced air heating, ventilation, and air conditioning

Technical Application

The Lukjan TO3606 is designed to connect rectangular main ducts to round branch ducts in air distribution systems. The straight side configuration facilitates installation along duct runs where space optimization and directional airflow are critical. Fabricated from galvanized steel, the takeoff provides long-term durability and corrosion resistance under standard HVAC operating conditions. The 6-inch round outlet accommodates standard round ducting and fittings, while the rectangular base allows secure attachment using drive slip, S-cleat, or flange methods per SMACNA installation standards. This fitting supports balanced airflow and reduces turbulence, maintaining system efficiency in both positive and negative pressure environments.

Specifications

• Fitting Type: Rectangular-to-Round Side Takeoff
• Series: T19
• Round Outlet Diameter: 6 inches (152.4 mm)
• Rectangular Base Width: 6 inches (152.4 mm)
• Overall Length: 8 inches (203.2 mm)
• Material: Galvanized Sheet Steel
• Typical Gauge: 26–30 GA (based on duct system requirements)
• Connection Ends: Slip-fit rectangular collar and plain round outlet
• Configuration: Straight side outlet
• Airflow Direction: Branch from main rectangular duct to round duct
• Surface Finish: Galvanized zinc coating for corrosion protection
• Pressure Class: Suitable for low- and medium-pressure duct systems
• Temperature Rating: Up to 250°F (121°C)
• Manufacturing Standard: SMACNA Duct Construction Standards
• Compliance: ASTM A653 / G90 Zinc Coating
• Usage: HVAC distribution systems – supply, return, and exhaust

Installation and Use

Install in accordance with SMACNA and local mechanical code requirements. Secure the rectangular collar to the duct wall using approved fastening methods, ensuring proper sealing around all seams to prevent air leakage. Connect round duct sections using standard slip-fit joints or approved couplings. Apply duct sealant or mastic where required to maintain system pressure integrity. The 90° branch orientation may be adjusted in layout to maintain balanced air distribution.

Summary

The Lukjan TO3606 Rectangular-to-Round Side Takeoff provides a durable and precise duct transition for 6-inch round branch connections. Fabricated from galvanized steel and built to SMACNA standards, it ensures efficient airflow, corrosion resistance, and mechanical strength in commercial and residential HVAC duct systems. The straight side takeoff design allows compact installation while maintaining system integrity and performance under demanding service conditions.