fire separation(стена или перекрытие – Unprotected openings in fire separations void the fire-resistance ratings of the fire separations that contain them, allowing spread of fire past the limits of the fire safety plan of the entire building. wiki Alexander Demidov)
fire wall(1. A fire-resisting wall separating two parts of a building from the lowest floor to several feet above the roof to prevent the spread of fire. 2. A fire-resisting wall surrounding an oil storage tank to retain oil that may escape and to confine fire. MHST Alexander Demidov)
