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"First off, a 20x20 decorative air return grille will require a larger frame for optimum installation. This means that a 20x20 decorative air return grille with 22x22 dimensions will need a 20x20 hole and a 22x22 frame to fit properly.Once you've got the sizes sorted, unscrew the frame and then take out the grille. Next, put the frame in place and secure it with screws. Once that’s done, install the new grille to complete the task.For high-quality products with visual appeal, browse our full range of air return grilles."
<https://hvacpremium.com/products/16w-x-20h-aluminum-adjustable-return-supply-hvac-air-grille-full-control-horizontal-airflow-direction-vent-duct-cover-single-deflection-outer-dimensions-1785w-x-2185h>