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The SOUTHWARK METAL FR_16X20 is a return air sheet metal duct filter rack designed to hold standard 1-inch filters in residential and light commercial HVAC duct systems. Constructed from hot dip galvanized steel at 28 gauge, this rack opens on the short side for filter access in tight return air installations. It fits a 16-inch by 20-inch filter opening and is built to the dimensional and fabrication standards set by ACCA and SMACNA. HVAC technicians and sheet metal contractors install this rack directly into the return air duct to create a serviceable filter slot without field fabrication.
This filter rack is used in return air duct assemblies where a dedicated filter slot is needed at a 16-inch by 20-inch opening. It is suited for residential forced-air systems and light commercial applications where return air filters are installed within the duct run rather than at a grille or air handler cabinet. The short-side opening design allows installation in applications where clearance is limited on the long dimension of the duct.
Designed as an OEM-style sheet metal component for installation in return air duct systems requiring a 16-inch by 20-inch filter rack opening with a 1-inch filter depth.
Installation is performed by licensed HVAC technicians or qualified sheet metal contractors. The system should be powered down and the air handler shut off before cutting into an existing return air duct or installing the rack in new construction. Sheet metal screws and approved HVAC foil tape or mastic sealant are typically used to secure and seal the rack to the duct. Work should conform to SMACNA duct construction standards and local mechanical codes.
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