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This is an architectural/engineering drawing depicting a Second Floor HVAC Piping Plan for a building facility. The schematic shows the layout and routing of heating, ventilation, and air conditioning system components across the second floor, including multiple classrooms (labeled 21D, 21E, 21F, 21G), a computer maintenance room (22Q), corridors (22Z), and other spaces. The plan identifies specific piping runs, connection points, ductwork locations, and mechanical equipment placement with corresponding identification numbers and dimensional references.

The drawing includes critical sheet notes specifying construction requirements: (1) all piping penetrations through fire-rated walls or enclosures must be sealed with fire-proof materials and caulked where enclosure walls have been penetrated, and (2) condensate drains require proper slope and direction, with combined drains from Level 5 providing condensate drainage from the Level 5 floor drain below the raised floor system. The plan references a Part B document and indicates this is Size D drawing M-10 in the construction document set, with standard architectural notation including scale indicators and revision information visible in the title block.