Abstract: The present invention is relative to a damper (5) adapted to regulate an air flow orifice (7) for passing of an air flow in a ventilation duct (2), wherein the damper (5) comprises a plate (11), a regulating device (12) and a mounting element (13), wherein the mounting element (13) is resilient and comprises a first and a second end (19, 20), the distance (L1, L2) between the first and the second end (19, 20) being arranged to change when the mounting element (13) bends resiliently, and wherein the first and a seconds end (19, 20) are adapted to cooperate with an inside of the ventilation duct (2) to removably mount the damper (5) in the ventilation duct (2), and a ventilation system (1) comprising such a damper (5).

Abstract: A ventilation device 21 configured to be connected to a mouth of a ventilation duct 9 between the ventilation duct and an outside space. The ventilation device comprises an airflow opening 27 for passage of an airflow 30 between the ventilation device and the outside space. An air-permeable material 29 is arranged in the airflow opening 27.

Abstract: A system or a method for measuring flow of fluid or gas, has a flow duct with at least two transducers which generate at least one beam of ultrasound in the flow duct in which ultrasound transducers are placed in a fixed positions in a duct for flowing air where the electronic device for analyzing signal from the transducers is performed in a handheld device. A transmitter circuit is permanently connected to the transducers and a receiver circuit is placed in a handheld device. The transmitter circuit has calibration data representing the actual placement of the transducers in relation to the actual duct, which calibration data is communicated by every connection to the receiver circuit. Hereby can be achieved that transducers can be permanently placed in ventilation ducts in buildings, where placement of ultrasound transducers for measurement and for calibration of measurement of an air stream is nearly impossible.

Abstract: The present invention is relative to a damper (5) adapted to regulate an air flow orifice (7) for passing of an air flow in a ventilation duct (2), wherein the damper (5) comprises a plate (11), a regulating device (12) and a mounting element (13), wherein the mounting element (13) is resilient and comprises a first and a second end (19, 20), the distance (L1, L2) between the first and the second end (19, 20) being arranged to change when the mounting element (13) bends resiliently, and wherein the first and a seconds end (19, 20) are adapted to cooperate with an inside of the ventilation duct (2) to removably mount the damper (5) in the ventilation duct (2), and a ventilation system (1) comprising such a damper (5).

Abstract: The invention relates to an arrangement in the ventilation of a kitchen appliance. The arrangement is arranged to be connected to a ventilation system. The arrangement includes at least one hood (10), which is intended to be installed above the kitchen appliance (11). There is an exhaust-air connection (27) in each hood (10), for connecting the hood (10) to the exhaust-air duct (12) belonging to the ventilation system. The arrangement also includes a separator (15), for separating grease form the exhaust air. The arrangement further includes a cell (14), which is arranged after the hood (10) and is separate from the hood (10), and to which a separator (15) is fitted, and which is connected to the exhaust-air duct (12).

Abstract: A system or a method for measuring flow of fluid or gas, has a flow duct with at least two transducers which generate at least one beam of ultrasound in the flow duct in which ultrasound transducers are placed in a fixed positions in a duct for flowing air where the electronic device for analyzing signal from the transducers is performed in a handheld device. A transmitter circuit is permanently connected to the transducers and a receiver circuit is placed in a handheld device. The transmitter circuit has calibration data representing the actual placement of the transducers in relation to the actual duct, which calibration data is communicated by every connection to the receiver circuit. Hereby can be achieved that transducers can be permanently placed in ventilation ducts in buildings, where placement of ultrasound transducers for measurement and for calibration of measurement of an air stream is nearly impossible.

Abstract: The invention relates to a plenum box (1a, 1 b) configured for use in a ventilation system (2) with flowing air in order to be able to quickly regulate flows between the ventilation system (2) and a room. The plenum box (1) comprises a pressure distribution pipe (4) which is disposed in an inlet (3) to the plenum box (1) and which itself comprises a regulating damper (5), and an outlet (6a, 6b). The inlet (3) is configured to have an air flow (7) passing through it. The pressure distribution pipe (4) extends inside the plenum box (1a, 1b) from the inlet (3), and the surface of the pressure distribution pipe (4) has perforations (8) which allow the air flow (7) to pass through them between the inside (9) and outside (10) of the pressure distribution pipe (4).

Abstract: The invention relates to a wall framing system (1), comprising a channel member (2 and a stud member (6) for interconnection with said channel member (2), the stud member (6) being insertable between side walls (4, 5) of the channel member (2), and comprising locking means or members (10) for fixating the stud member (6) to the channel member (2), where said locking members (10) are arranged to exert a force on inner surfaces (11, 12) of the side walls (8, 9) of the stud member (6) such that, when the locking means (10) are engaged with the stud member (6), outer surfaces (13, 14) of the side walls (8, 9) of the stud member (6) are pressed against inner surfaces (15, 16) of the side walls (4, 5) of the channel member (2) thereby achieving a frictional engagement between the contacting surfaces of the stud member (6) and the channel member (2). The invention also relates to a stud member (6) for use in a wall framing system (1) as described above.

Abstract: In an arrangement for connecting tube elements of a ventilation duct system, the inner tube (3) has an abutment (7) for engagement with a matching abutment (8) of the outer tube (1). By insertion of the inner tube (3) into the outer tube (1) the abutments (7, 8) are brought into engagement in a plane (P) perpendicular to the direction of insertion for providing coupling between the abutments and thereby connection of the tubes (1, 3). The abutment (7) of the inner tube (3) is continuous along the circumference of the tube (3) and formed in a bent end portion (20) of the inner tube (3).

Abstract: An assembly system for coupling a first pipe element (2) and a second pipe element (3) has a circumferential clamping device (5) to be applied on the outside of the ends of the pipe elements and to be tightened around the same when the two pipe elements (2, 3) are placed end-to-end. The system also has a coupling device (6) to be arranged between the ends of the first and the second pipe elements (2, 3) and beneath the circumferential clamping device (5), so as to align and/or hold the two pipe elements (2, 3) during the assembly. A method of coupling a first pipe element (2) and a second pipe element (3) is also disclosed, as well as a coupling device (6) and use of the assembly system (1).

Abstract: A flanged coupling ring for a duct element has a mounting section configured to be mounted or a connection portion of the duct element, and flange means extending outwards from the mounting section. The flange means has, along its periphery, flanged coupling portions for connecting two duct elements, each of which is provided with a coupling ring, by means of external coupling means configured to engage with the flanged coupling portions.

Abstract: In a method of reshaping a tube, an apparatus is used which has a roller nip for rotating the tube, and a shaping roller assembly for altering the cross-section of the tube, for instance from round to oval.

Abstract: A flanged coupling ring for a duct element has a mounting section configured to be mounted or a connection portion of the duct element, and flange means extending outwards from the mounting section. The flange means has, along its periphery, flanged coupling portions for connecting two duct elements, each of which is provided with a coupling ring, by means of external coupling means configured to engage with the flanged coupling portions.

Abstract: There is provided a double-walled structure for coupling to another double-walled structure. The coupling connects one female end portion of the one structure and one male end portion of the other structure together. The connecting requires only connecting of the outer walls of the structures together, providing an overlapping connection. The inner walls of the structures have a gap between their ends, when connected. Thereby the coupling of the structures is facilitated. The space between the inner wall and outer wall of the structure is occupied by an insulating material, such as a sound absorbing fibrous batting. The space between the male/female end portions for connection to a female/male end of another structure is filled by a seal, preventing loss of insulating material and providing insulation of the joint coupling the double-walled structures together. The structure can be used, especially, as a segment in a sound-absorbing ductworks system.

Abstract: A method for converting a representation of a ventilation duct system in a computer readable form from a first duct type to a second duct type, such as circular and rectangular ducts. The method identifies straight duct elements in the system, calculates an equivalent size of one or several duct elements of the second duct type to provide the same performance as the duct elements of the first duct type; and connects the duct element of the second duct type with connection duct elements in accordance with the connection of the corresponding elements in the original ventilation system, whereby a converted representation of the ventilation system is obtained.

Abstract: In a method of manufacturing a helically-wound lock-seam tube for a ventilation duct system, the tube is provided with a plurality of air nozzles through its wall. The method involves the steps of: feeding a strip of sheet metal from a supply to a punching and pressing unit; punching and pressing the strip in the punching/pressing unit to form two rows of spaced openings through the strip; feeding the punched strip to a roller unit, in which a longitudinal bead is formed in the strip; feeding the punched and beaded strip to a forming head in which the strip is helically-wound to form a tube having a helical lock seam; feeding the helically-wound lock-seam tube out of the forming head; and cutting the tube into desired lengths. The apparatus has components for carrying out the various method steps, and the finished tube is provided with a desired pattern of air nozzles.