Replacing or buying new Durable Air Return Grills/Vent Covers for your Home: This Cast Aluminum 8″ X 22″ size fits most Standard air ducts opening sizes for walls, ceilings, and floors, – Indoor use. It returns cold air from room for better circulation. These floor registers are sand casted, hand crafted and finished. Vent cover overall top Faceplate Size is 9-1/2″ x 23-3/4″. Face plate thickness is 5mm. Listed product sizes refer to the duct opening measurements, outer dimensions of the cover faceplate, in most cases are 1″ or longer on each side/direction