When reading blueprints for proper wall and duct location, the technician should look at the ______.

• A. Elevations drawing
• B. Piping isometrics
• C. Electrical diagram
• D. Floor plan

Answer: (D)

Understanding where walls and duct paths fit in a building comes from the floor plan. This drawing provides the top-down view of the spaces, showing exact wall locations, room sizes, doorways, and openings, which is essential for deciding where to place walls and route ducts. Elevations show vertical details like wall heights and finishes, not the horizontal layout of spaces. Piping isometrics focus on the routes and elevations of pipes, not the overall wall layout. Electrical diagrams map circuits and wiring, not where walls and ducts run. So for planning wall placement and duct runs, the floor plan is the primary reference because it directly represents the spatial arrangement you’ll work within.