🔍 Key Concepts
• Review the Fire Control Plan legend for symbols related to fans, dampers, or ventilation ducts.
• Compare the shapes and context of symbols 18, 34, and 69 to see which are associated with air movement or ducting rather than with extinguishing agents or equipment.
• Think about how ventilation is controlled during a fire (e.g., dampers, shutoffs, ventilation zones) and which symbols on the plan would show those features.
💭 Think About
• For each numbered symbol in the choices, ask: does this look like something that MOVES air or CONTROLS airflow, or does it look like a fire-extinguishing or detection device?
• Look at where similar symbols appear elsewhere in the sheet (same style or family of symbols). Are they grouped with valves, dampers, or mechanical controls, or with portable equipment and alarms?
• Focus on the geometric design of each symbol (triangles, valve shapes, hooks, circles, etc.). Which of these shapes are commonly used for valves/dampers in piping or duct systems?
✅ Before You Answer
• Verify which symbol(s) are clearly marked or commonly recognized as dampers/valves in ducts rather than hoses, hooks, or extinguishers.
• Double-check that you are matching the exact symbol numbers (18, 34, 69) from the legend, not just a similar-looking icon elsewhere on the sheet.
• Before picking "All of the above," confirm that each of the three symbols can reasonably be part of a ventilation system; if even one is clearly unrelated (like a tool or hose), that choice cannot be correct.