The term used to reference doors, panels, frame and partitions that are fabricated from cold formed steel sheet and coil. These doors and frames are internally reinforced and insulated, but are in a sense “hollow”, thereby the term HOLLOW METAL. The minimum gage of steel considered to be classified as Hollow Metal Door is 20 Ga. The C.S.I. Broadscope location for this product is usually found in Section #08110.