Product details:

Faceplate dimensions measure 21 13/16 x 25 13/16. The approximate thickness of the faceplate is 3/16 inch and drops into the hole opening approximately 3/4 inch. Order this 20 x 24 floor grille to get a return vent cover that has the strength to hold up to heavy foot traffic. Made of 100% steel, this 20 x 24 floor grille has a light cinnamon coloring that blends well with many different types of floors. The return vent cover features a smooth surface that has an air flow free area averaging 75%. Its sturdy construction and commercial grade strength will keep your large 20 x 24 floor vent hole covered. The outside dimension of this return vent cover is 21 13/16 x 25 13/16 inches.