An additional cover provides a cabinet with protection from fluidic ingress. The additional cover includes first and second portions having first and second main sections, respectively, and first and second flanges, respectively, and first and second sidewalls extending between corresponding sidelong edges of at least the first and second main sections. The first and second portions and the first and second sidewalls are arranged to define a flow passage with an inlet at an upper end thereof and an outlet at a lower end thereof. The first and second flanges are provided at the inlet and outlet, respectively, to prevent fluid flow through the flow passage.