fire door; fire shutter
A door or shutter designed to prevent the spread of fire, often used in buildings. The cross-reference 防火戸 is a broader term that includes fire doors and fire shutters.
See also: 防火戸
This building is equipped with fire doors.
火災時には防火扉が自動的に閉まります。
In the event of a fire, the fire doors close automatically.