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STEP 1:REMOVE YOUR EXISTING VENT COVERDo not measure your existing cover.STEP 2:MEASURE THE DUCT OPENING IN YOUR FLOOR, WALL OR CEILING.If you're working on a new construction, simply measure the opening in your floor, wall or ceiling.
STEP 3:MATCH THE DUCT OPENING SIZE TO THE CORRESPONDING VENT COVER SIZE LISTED ON THE PRODUCT LISTING.The width and length of your opening should match the width and length of the inside measurements of the grille.
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