For sale is a antique cast iron, arched, air vent cover.  This is an adjustable vent cover. This very nice.  There are no breaks or cracks. This works as it should. The cover is 14 1/2" tall and 11" wide with tabs.  This fits 12 5/8" x 8 5/8" opening, 3/4" wide flange and 2 1/2" deep.