Abstract: A system for increasing the fire resistance of support ceilings and limiting damage caused by water as a result of fire-extinguishing operations to the respective localities. The system including a suspended fire resistant covering with sprinkler elements, the covering being composed of arched ceiling elements along which the liquid travels, the ceiling elements having side edges accommodated by collecting channels which receive the liquid coming from the sprinkler elements. A distance is maintained between side edges and the walls of the collecting channels for liquid flow into the channels and exhaust air flow upward through the covering.

Abstract: A subceiling 10 for kitchens and the like includes upwardly arched condenser panels 12 whose free edges are disposed above hollow, U-shaped collecting channels 14. The interiors of the channels may be supplied with cold water to promote condensation or with hot water to melt and drain off fatty deposits.

Abstract: A false ceiling (10) includes a plurality of concave panels (12, 60) having liquid spray nozzles (40, 62) at their crowns. The liquid streams down the undersides of the panels to collecting channels (16) and carries with it particles of dirt, grease, etc., entrained in vapors from kitchen burners or the like below. Air is exhausted through the spaced openings between the edges (14) of the panels and the sides (18) of the collecting channels.