Abstract: A sheet metal profile member (22) for the construction of a frame structure for a box-shaped casing for ventilation or air treatment devices. The sheet metal profile member has a substantially square cross-section with an internal cavity (23) and a guide flange (44), which is retracted in the region of an external corner edge (22a), so as to enable interconnection of adjoining frame structures both vertically and horizontally by means of a guide engagement rod (20).

Abstract: A supply air device for spreading an air flow from a generally flat, perforated external element (21,22,23) comprising a box-like casing (10) serving as an air distribution chamber and having means for connection to a supply air duct, and at least one primary side-spreading device (18,26) located in the distribution chamber and being adapted to bring about a forwardly directed, transversally diverging air flow towards and through perforated external element. Side guiding plates (24,25) are provided in the distribution chamber so as to extend between the primary side-spreading device (26) and side edge portions (22,23) of perforated external element, guiding plates being bent into a convexly curved configuration, as seen from the front of the device, whereby the air flow (P1,P2,P3) is caused to additionally diverge transversally, especially to about 180.degree..

Abstract: A frame structure for the construction of a box-shaped casing, in particular for air treatment devices. The frame structure comprises straight profile members (22), on the one hand, and corner elements (50,52) with three mutually perpendicular protrusions, each being connectable to one of said profile elements, on the other hand. Each corner element consists of two parts, namely an external part (50) including the external portions (50a, 50b,50c) of said protrusions and an internal part (52) including the internal portions (52a,52b,52c) of the protrusions. Said protrusion portions together form a closed cross-section fitting internally into the likewise closed cross-section of the profile members (b 22). The profile members can be slid onto the corner element protrusions while simultaneously securing the external and internal corner element parts (50,52).

Abstract: An air supply device (17,18) including an elongated blow opening (23) for blowing ejector air (P1,P3) directed towards an exhaust device for entraining polluted air or other gases which are to be exhausted. A casing (17,18) is provided with a shield wall (19,20) adjacent to one side of the blow opening (23), so that the polluted air or other gases are caused to flow (P2) around the casing and to be entrained (P1) adjacent to the other side of the blow opening.

Abstract: An exhaust device comprising an elongate hood having side walls (3,4). An internal, centrally located deflection casing (10) has two mutually aligned suction openings (8,9) which, in combination with an air-supply device (6) disposed at the bottom of the hood, causes the generation of two axially aligned rotational flow patterns (P2, P'2) in the hood between each side wall (4,3) and the central deflection casing (10), from which polluted air is exhausted (via 11,12).

Abstract: A cell filter apparatus of the bag or stocking type having a housing is disclosed. A gas deflector and boundary wall between a raw gas duct and a dust chamber upstream from the filter cells form a tapering duct having an outlet passage for coarse dust particles at its narrow end. Either the deflector or the boundary wall is pivoted so that the size of the outlet passage can vary so as to remove coarse dust from the outlet passage. A gas blast for cleaning the filter cells in a direction to move the pivoted element so that the outlet passage is varied and cleaned.

Abstract: Apparatus for intermingling dust-carrying gas and bulk goods for treating either one, e.g. drying the bulk goods or scrubbing the gas, in a bed of the bulk goods aerated by the gas. The apparatus comprises a grating with through-flow openings for a first partial stream of the gas which are so directed that this first partial stream flows substantially horizontally from the outside and inwardly towards the middle of the bed and another gas inlet in the middle of the grating for introducing a second partial stream of the gas from below and upwardly in the bed. A dust separator is arranged for scrubbing the first partial stream before it is supplied to the through-flow openings of the grating. The other gas inlet is connected so that the second partial stream is supplied to the grating more rich in dust than the first partial stream.

Abstract: A stiffening device for filter hoses of square crosssection includes two substantially identically shaped wires or strips. Each wire or strip is bent along a single plane repeatedly substantially at right angles to each other to form a zig-zag configuration having alternate longitudinally and transversely extending portions. The length of each of the transversely extending portions correspond to the diagnonal measurement of the hose. The two wires or strips are connected with each other at the centre points of the transversely extending portions and at right angles to the individual plane of those portions.