Lukjan DX311020 Offset Start Collar 20x10 Hvac Duct

Product Description

The LUKJAN DX311020 is a 20 x 10 inch offset start collar designed for use in sheet metal duct systems. An offset start collar connects a rectangular duct trunk to a branch run or plenum takeoff where the branch centerline does not align with the trunk centerline. The offset geometry allows installers to position branch ducts closer to walls, obstructions, or other mechanical systems where a straight collar would not fit. This fitting is a standard component in low-pressure residential and light commercial supply air distribution systems and is typically installed by licensed HVAC sheet metal technicians during new construction or system modification.

The DX311020 is sized at 20 x 10 inches, making it suited for medium to large trunk duct applications where a side-entry branch connection is required. It fits into typical residential forced-air systems and light commercial duct layouts where spatial constraints require an offset takeoff rather than a direct centered connection. The fitting integrates into standard rectangular duct runs following conventional sheet metal fabrication practices.

Key Features

• 20 x 10 inch offset collar accommodates medium-to-large duct trunk connections
• Offset design allows branch positioning off-center from the trunk duct centerline
• Purpose-built as a start collar for connecting branch runs at the plenum or trunk
• Manufactured by LUKJAN, a recognized HVAC sheet metal fitting supplier
• Categorized as an HVAC duct fitting collar for low-pressure air distribution systems

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard rectangular sheet metal duct systems requiring an offset start collar at 20 x 10 inches.

Installation Notes

Installation should be performed by a qualified HVAC technician or licensed sheet metal contractor following applicable mechanical codes, including SMACNA duct construction standards. Shut down the air handling unit and confirm the system is de-energized before cutting into an existing trunk or plenum. Secure the collar with sheet metal screws and seal all joints with UL 181-rated mastic or foil tape to maintain system pressure integrity. Do not use this fitting in pressurized systems exceeding the collar's rated low-pressure classification.

Technical Specifications

• Size: 20 x 10 inches
• Product Type: Offset Start Collar
• Category: HVAC Duct Fitting
• Subgroup: Offset Collars

Standard Information

• Brand: LUKJAN
• Manufacturer Part Number: DX311020