The first letter indicates usage. B Stands for bottled goods.
S Stands for showcase.
The second letter indicates the condensing unit position. S Means standard bottom mount unit.
R Means remote-condensing unit; order with or without unit.
T Means top mounted unit.
The next numbers refer to cooler width. 52 Means 52″.
The letters that follow the numbers indicate the type of doors. GD Means gliding or sliding doors.
SD Means swinging or hinged doors.
Any letters following those two letters indicate a specialty. HD Means heavy duty.
SS Means stainless steel.
F Means foamed in place polyurethane insulation.