FIELD: building units, particularly fire doors.
SUBSTANCE: hydraulic fire door, for instance horizontal sliding door, may be selectively opened or closed. The door is provided with executive mechanism to move the door between opened and closed positions. Hydraulic executive mechanism may supply aqueous based liquid to the fire door for cooling thereof.
EFFECT: increased fire resistance and possibility to create compact fire-extinguishing system.
28 cl, 6 dwg
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