Which symbol is used to indicate a fire damper in a vertical duct?

The diamond shape is used to represent a fire damper in a vertical duct. This symbol is part of a standardized set of symbols and notations in the field of sheet metal and HVAC that ensures clarity and consistency in design drawings and schematic representations. The use of a diamond shape effectively distinguishes a fire damper from other duct components, allowing for quick recognition by technicians and engineers during both installation and maintenance.

Using distinct symbols like this is critical for safety in HVAC systems, where fire dampers play a crucial role in containing smoke and fire, thus enhancing the building's safety. By using a recognizable symbol, it reduces the chances of error in both the interpretation of schematics and the physical installation of these components. Understanding and recognizing these symbols is essential for anyone involved in the design, installation, and maintenance of heating, ventilation, and air conditioning systems.