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This is a Third Floor HVAC Piping Plan, which is an architectural/engineering drawing that depicts the heating, ventilation, and air conditioning system layout for the third floor of a building. The plan shows the piping configuration across multiple classrooms (labeled Classroom 3.1-3 through 3.12) and various mechanical equipment spaces, including mechanical and electrical equipment rooms. The drawing utilizes a grid system with columns labeled A through K and rows numbered vertically, with individual spaces identified by reference numbers.

The plan includes detailed piping routing for the HVAC system, with callouts indicating connection points, equipment locations, and directional flow. Sheet notes specify two critical requirements: (1) where piping penetrates fire-rated walls or enclosures with openings, the penetration shall be sealed with fire-proof material equal in rating to the wall or enclosure that has been penetrated; and (2) condensate drains (return column line 3 to 7) should be routed to floor drains raised to Level 1, with condensate routed to an appropriate drain location. The drawing references additional details on related sheets for contamination and complete system specifications. The document includes a standard title block with project identification, scale (shown as 1/8"), date information, and revision history in the margin.