Abstract: A blowing nozzle for a highly pressurized gaseous fluid comprising at least two narrow slot-form exhaust passages (12) having a width (d) insignificantly larger than the size of polluting particles occurring in said fluid and a length (L) no more than ten times the average width (d) of each slot, the exhaust passages extending in parallel or radially over the end surface of the nozzle in a projection perpendicular to its longitudinal axis.

Abstract: A sealing means for a door lacking a threshold comprises a lath of resilient material, which with a substantially plane main portion is attached to the lower edge of door leaf. A head, enlarged with respect to the main portion, is provided with sealing ridges and may be bent in relation to the attachment of the lath, so the ridges will be forced towards the floor. An actuating member, comprising a longitudinally compressible leaf spring, is fitted between the lower edge of the door leaf and the head of the lath, so it extends outside the vertical hinge edge of the door leaf. Just before the door reaches its closed position the leaf spring contacts the door frame, and will then force the portion of the head adjacent to the hinge edge downwards. During the terminal portion of the closing movement the friction between the floor and the downwardly turned portions of the ridges will "roll" the head to full contact with the floor.

Abstract: A sound insulating building element or structural member includes a plurality of parallel sheet elements of which a first, inner, thick element is stiff and has a plurality of internal cavities, a second, inner, stiff element is substantially pervious to air and connected to one main surface of the first, inner element, and an outer, impervious element is arranged at a small distance from the second, inner element in such a manner that substantially the entire outer element can oscillate freely in relation to the second, inner element, the other main surface of the first, inner element being connected to a sheet material having an E-modulus greater than 10.sup.9 and which can be substantially impervious to air, or similar to the second, inner element, can be pervious to air and be connected over an air gap to an outer substantially impervious sheet element.