Abstract: A panel (10) for a suspended heating and/or cooling ceiling comprises a flat metal cassette having mutually spaced upper and lower metal sheets (11, 12) defining a sealed space (17) therebetween. The metal sheets are perforated by registering apertures (13, 14) which are sealed against the space along the circumference thereof. At least one of the metal sheets around each aperture forms an embossment (15) attached to the other metal sheet as a spacer between the metal sheets. An inlet (19) and an outlet (20) communicate with the space for circulating a fluid heat carrier through the space in heat exchanging relationship with the panel.

Abstract: A suspended ceiling (C) comprises one or more panels (P) containing water (W) arranged so that the water is in contact with substantially all of the lower surface (10) of the panels (P).

Abstract: A collapsible ladder consisting of a plurality of telescoping upright sections in which the uppermost rung of each section is fixedly mounted in the uprights, and in which the uprights of one or more upper sections are provided with longitudinal guideways in which end portions of at least the lowermost one of the rungs of the section are displaceable.