Electrical enclosure with ventilation structure

An electrical equipment enclosure, comprising:

• a cabinet defining a storage compartment configured to contain electrical equipment, the cabinet having a vent opening communicating the storage compartment with an exterior of the cabinet, a door reaching across an open front side of the storage compartment, and a rear wall panel facing outward from the cabinet in a rearward direction;
• a box structure having a first open side received over the vent opening, a first closed side opposite the first open side, a second closed side extending from the first open side to the first closed side, and a second open side opposite the second closed side, the second open side having an outlet opening facing outward from the box structure in the rearward direction;
• and
• a baffle located in the box structure between the first open side and the second open side, wherein the baffle is joined to the box structure at a corner where the first open side intersects the second open side, reaches inward from the corner in a direction diagonally toward an opposite corner where the first closed side intersects the second closed side, and has a free end spaced from the sides of the box structure, whereby the baffle is interposed diagonally between the first open side and the second open side such that the baffle and the box structure define a convoluted air flow path from the vent opening through the first open side of the box structure, inward through the box structure from the first open side toward and around the free end of the baffle, and further from the free end of the baffle through the box structure to the second open side, to ventilate heat from the storage compartment and to inhibit debris from passing through the box structure oppositely along the convoluted air flow path and entering the storage compartment through the vent opening.