Lukjan TO1005 Square to Round Adjustable Top Takeoff

Product Description

The LUKJAN TO1005 is a square-to-round adjustable top takeoff fitting used in sheet metal ductwork systems. It transitions from a rectangular duct collar to a round branch run, allowing installers to tap off the top of a main trunk duct. The adjustable design accommodates variations in duct height during rough-in, making field fitting faster and more forgiving. With a face size of 6 by 7.5 inches and a 1.25-inch rise, this fitting is sized for residential and light commercial forced-air distribution systems. Sheet metal mechanics and HVAC installers handle this type of fitting during duct fabrication and installation.

This takeoff is intended for top-entry branch connections off a rectangular trunk duct in forced-air heating and cooling systems. The square-to-round geometry directs airflow from the main duct into a round branch duct or collar. The adjustable feature allows the fitting to be set at the correct height to match the duct or insulation wrap thickness on-site. Typical applications include residential new construction and retrofit duct systems where branch runouts connect to diffusers, registers, or flexible duct.

Key Features

• Square-to-round transition allows a rectangular duct collar to feed a round branch runout
• Adjustable rise design accommodates field variations in trunk duct height
• 1.25-inch rise suits standard residential trunk duct installations
• 6 by 7.5 inch face dimensions fit common residential and light commercial trunk sizes
• Top-entry orientation keeps branch connections clear of floor or ceiling obstructions

Compatibility

Designed as an OEM-style sheet metal fitting for use with standard rectangular trunk ducts in residential and light commercial forced-air HVAC distribution systems.

Installation Notes

This fitting is installed by sheet metal mechanics or licensed HVAC technicians during duct system fabrication. Power down the air handler or furnace before cutting into an existing trunk duct. Secure the takeoff collar with sheet metal screws and seal all joints with UL-listed duct sealant or mastic per applicable mechanical codes. Follow local SMACNA standards and mechanical code requirements for duct fitting support and sealing.

Technical Specifications

• Face Size: 6 x 7.5 inches
• Rise: 1.25 inches
• Type: Square to Round Adjustable Top Takeoff
• Application: HVAC Duct Distribution
• Category: Takeoffs / Spinoffs

Standard Information

• Brand: LUKJAN
• Manufacturer Part Number: TO1005