In a modular packaging system for electrical equipment, two or more modules are arranged horizontally or vertically relative to one another. Each module includes electrical equipment, a cabinet in which the electrical equipment is disposed, and a fan assembly for forcing air through the cabinet to cool the electrical equipment. The cabinet includes an inner cabinet wall forming an air shaft, a vertical space extending between a top and a bottom opening in the cabinet, and a horizontal space extending between a left and a right opening in the cabinet. The cabinet is further formed with a first and a second opening. The second opening is formed in the inner cabinet wall. The fan assembly forces air through the first opening of the cabinet, past the electrical equipment, out the second opening of the cabinet, and into the air shaft. The modular packaging system further includes a chimney formed by aligning the air shafts of two or more modules arranged vertically relative to one another and a vertical cable chute formed by aligning the vertical spaces of the two or more vertically arranged modules. The modular packaging system further includes a horizontal cable chute formed by aligning the horizontal spaces of two or more modules arranged horizontally relative to one another.