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 dust separator for a vacuum cleaner, in which the bag is sealingly connected to a rigid member that screens-off an air-flow passageway through the vacuum cleaner and has an opening with which the bag connects. The screening member is separate from the bag. Mounted at the orifice of the bag is a flange which functions to prevent the bag from being drawn through the opening in the screening member in the direction of air flow through the vacuum cleaner. The flange can be collapsed to enable it to be passed through the opening in the screening member when the bag is full.