防火扉

1. Origins, structure, and basic meaning

• Structure: 防火扉 is read as ぼうかとびら and is a facility noun combining 防火 and 扉, referring to a door installed for fire safety.
• Basic usage: It appears in instructions to keep its approach clear and in drills that check how it closes.

2. Common pitfalls and similar expressions

• Functional focus
  • It is a fire-safety installation, not merely any door located near a fire source.
• Location patterns
  • Use 防火扉の前 for the space in front and 防火扉が閉まる仕組み for its closing mechanism.