Nederman Holding Ab

Klaus Bihlet

Christian Norman

Bartosz Kowalski

Jacek Czyzewski

A ventilation system is disclosed comprising a main duct () connected to at least one motorized fan (), and further connected to at least one workplace (Wa; Wb; Wc) via a local duct arrangement (). The local duct arrangement comprises an asymmetrical bend duct section (). A first and a second pressure sensor () are arranged on different positions on the outside of the bend duct section and in communication with the interior thereof. The pressure sensors are configured to communicate with a control computer () configured to determine a pressure difference between the positions of the sensors and to control the speed of the fan. Further, a method of operating a ventilation system is disclosed and also an asymmetric bend duct section and the use thereof.

Ventilation system, a method of operating a ventilation system, a duct section to be used in a ventilation system, and the use of such duct section

A back pressure flap valve arrangement is disclosed. The arrangement comprises a housing () having an inlet opening () and an outlet opening () adapted for connection of the housing () to a ducting (), and at least one side wall () extending along a flow direction through the housing () from the inlet opening () to the outlet opening (). A flap () is pivotably hinged about a shaft () thereby being movable between an open position and a closed position, said shaft () extending transverse the flow direction. At least one locking device () is fixedly mounted to the side wall () and comprises a locking pin () and a stopping member (). The locking pin () is movable between a retracted position and a locking position, and being biased towards said locking position. The stopping member () is movable from a stop position in which the stopping member () is adapted to hold the locking pin () in its retracted position, to a release position by the flap () acting on the stopping member () in case of a back pressure. Thereby the locking pin () is allowed to move into the locking position in which the locking pin () maintains the flap () in the closed position.

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Randers, Denmark

Klaus Bihlet