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The SOUTHWARK METAL 20_22X10 is a straight rectangular 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 transition point where a trunk duct connects to a plenum or air handler. At 22 inches in length by 10 inches in width, it fits standard rectangular duct configurations and is suited for both new construction and retrofit applications. HVAC sheet metal mechanics and duct installers work with this type of fitting during trunk line layout and branch takeoff planning. Compliance with ACCA and SMACNA standards ensures the fitting meets recognized industry specifications for duct construction and air distribution.
This collar is appropriate for residential and light commercial forced-air duct systems where a rectangular starting collar is needed at the trunk line. It is commonly installed at the supply plenum outlet or along a main trunk to establish the beginning of a rectangular duct run. The straight body pattern simplifies alignment during installation and reduces the need for field modification in straightforward duct layouts. It is a standard component in duct systems designed and laid out according to ACCA Manual D airflow principles.
Designed as an OEM-style sheet metal fitting for rectangular trunk duct systems in residential and light commercial forced-air HVAC applications requiring a 22-inch by 10-inch straight starting collar.
Installation should be performed by a qualified HVAC mechanic or sheet metal technician. Shut down and lock out the air handling system before connecting or modifying any duct components. Secure the collar to the plenum or trunk duct using sheet metal screws and seal all joints with UL 181-listed mastic or foil tape in accordance with SMACNA duct construction standards. Avoid over-driving fasteners into galvanized sheet metal, as this can compromise the seal at the connection point.
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