Southwark Metal 20_20X10 Trunk Duct Starting Collar 20x10

Product Description

The SOUTHWARK METAL 20_20X10 is a straight starting collar designed for sheet metal trunk duct systems in forced-air HVAC installations. Fabricated from hot dip galvanized steel, this collar provides a secure takeoff point where a trunk duct originates from an air handler, furnace plenum, or main supply duct. The straight body pattern allows for direct, inline connections without offset. Sized at 20 inches by 10 inches, it is suited for residential and light commercial ductwork applications built to ACCA and SMACNA standards. Sheet metal mechanics and HVAC installers work with this fitting during new construction and system retrofits.

This starting collar fits into forced-air supply duct systems where a trunk line begins at the equipment plenum or transitions from a larger main duct. The 20-inch by 10-inch opening accommodates standard rectangular duct sizes common in residential and small commercial layouts. It is installed during rough-in ductwork and is compatible with systems designed and fabricated to ACCA Manual D and SMACNA duct construction guidelines. The straight configuration simplifies alignment during installation, particularly in tight mechanical rooms or attic runs where offset fittings add complexity.

Key Features

• Hot dip galvanized steel construction provides corrosion resistance in mechanical and attic environments
• Straight body pattern allows direct inline trunk duct connections without angular offset
• Starting collar design establishes the origin point of a rectangular trunk duct run
• Sized at 20 inches by 10 inches to match standard rectangular duct dimensions
• Fabricated to ACCA and SMACNA applicable standards for duct system integrity

Compatibility

Designed as an OEM-style sheet metal fitting for rectangular trunk duct systems fabricated to ACCA and SMACNA standards in residential and light commercial forced-air HVAC applications.

Installation Notes

Installation should be performed by a licensed sheet metal mechanic or HVAC technician. The air handling unit or furnace must be powered down and the system depressurized before fitting the collar to the plenum or duct. Fasten with sheet metal screws and seal all joints with UL 181-rated mastic or foil tape per SMACNA guidelines. Follow local mechanical codes for duct support spacing and joint sealing requirements.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Size: 20 inches x 10 inches
• Body Pattern: Straight
• Type: Starting
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 20_20X10