Section detail of a mechanical enclosure or cabinet, maybe for a baseboard or wall heater. It features aluminum bar grilles (type LC-S-4) at both the top and bottom to allow for air circulation. Inside, you’ll find copper elements measuring roughly 100x100x20, held in place by specific element supports. The drawing also shows a pipe support near the base structure & detailed hatching for the concrete wall. This is a record drawing updated to as-built status, so it’s a solid reference for MEP installers. Incl. dimensions for the elements & specific material callouts like aluminum and copper.