Ventilation for horizontally mounted busway

A busway assembly including a plurality of busbars mounted in a horizontal orientation and stacked in a sandwich configuration for conducting electrical current. The busbars are enclosed within a housing having an H-shaped configuration and including side-panels with ventilation chimneys through which hot air circulates from a low area underneath the busbars to an upper area above the busbars. The ventilation chimneys include open-ended half-pipes that are inserted in respective apertures of the side-panels.