Patent ID: 8974585
Filing Date: 2015-03-10
Classification: B01D,F24F,H05K

Abstract:
1. A fan-and-filter unit to be mounted in the wall off a switch cabinet or housing, comprising a fan unit inserted in a fan housing, a filter mat arrangement mounted upstream of the fan unit and a fan cover immobilizing the filter mat, wherein the fan-and-filter unit has a filter mat monitoring unit which is designed to detect the service life and/or a degree of soiling of the filter mat arrangement and which comprises an insert integrated into the fan cover and having an illuminated display visible from the exterior of the fan cover facing away from the fan unit and being designed to display at least exceeding of a predetermined or predeterminable service life and/or a predetermined or predeterminable degree of soiling, wherein a recess adapted to the insert is formed in the cover in which the insert is accommodated, and the filter mat monitoring unit comprises a timer for determining the service life of the filter mat arrangement and/or a soiling sensor having at least one sensor element for determining the degree of soiling of the filter mat arrangement and a monitoring electronics to analyze signals output by the timer and/or the soiling sensor and to produce at least one drive signal for the illuminated display, and wherein the insert comprises at least one receiving chamber for an electric power supply unit, for the timer, for the monitoring electronics and/or for at least one sensor element and that the insert is attached to the fan cover from inside or outside, wherein either all components of the filter mat monitoring unit except at least one sensor element and/or an external electric power supply or all components of the filter mat monitoring unit including their electric power supply are received by the insert.