stru00f6mungsgleichrichter ordering in a ansaugbereich a fan with an axial anstru00f6mseite (20) and an axial outflow (30).with the stru00f6mungsgleichrichter more kreuzende faces which, by at least one umfangsstrebe (3, 4) and at least one radialstrebe (6, 7) are formed.and, at least in one of the faces of a druckmesskanal (8) is trained on the at least one outflow opening (30) step (11) isand with the druckmesskanal (8), a messu00f6ffnung (5) for connection to a measurement cable for connection to a pressure, or in the druckmesskanal (8), a pressure switch is integrated.
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