Ventilation fan
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The broken lines illustrate portions of the ventilation fan that form no part of the claimed design.
Claims
The ornamental design for a ventilation fan, as shown and described.
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Type: Grant
Filed: Sep 13, 2019
Date of Patent: Mar 7, 2023
Assignee: Ziehl-Abegg Se (Kunzelsau)
Inventors: Frieder Lörcher (Braunsbach), Georg Hofmann (Tauberbischofsheim), Sandra Hub (Pfedelbach)
Primary Examiner: Sharon S Oum
Application Number: 29/705,685