For sale is a Liberty Model 5020788 Commercial Air Filter, Serial No. 45. 23-3/4" X 23-3/4" X 13-1/2" Deep overall size. 5-1/2" Depth in front of mounting flange. 8" Depth in back of mounting flange. 1/60/ 115V Single phase AC input. Uses standard 20" X 16" X 1" replaceable filter element.