The C140 has a streight up front 18 inch shield, a 12 inch top shelf, and a 11 inch mid shelf. There are five different support styles which can be used in any combination. This is a single bay unit using Closed Supports on both ends. This support style is closed for 12 inches on the counter, which does not meet NSF requirements. This unit has a 48 inch bay. A single bay can be as small as 24 inches and as large as 84 inches. There are two standard shield heights (18 and 22 inches ) there are three standard top shelf depths (12, 18 and 22 inches). Custom heights and depths are available.