Screw out the old grille, and then unpackage and screw in your new grille. All HVAC Premium grilles come with either black or white hex head screws to match the color of your grille. If you're installing a filter model, you'll need to open the filter grille and find the holes at the sides to screw into the wall. Once you close the filter door, the screws won't be noticeable.
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