Although 2 Wpro filters were appointed, 2 cheap filters were sent by the sender. In the package was the leaked coal dust the activated carbon. Enclosed an info that is normal that one must cover the exhaust opening with a cloth only at initial usage in the hood. After my complaint the right Wpro filters were delivered sand. And as with earlier ordered Wpro filters this problem occurred in this far not to. Otherwise you can not say much about the filters, they verichten their work, filtering grease and odors from the air sucked in the Dustabzugshaube. Even in an exhaust hood as in my (in recirculation hoods duty) are recommended because the fan motors and the exhaust ducts is no longer covered with a smelly and sticky layer of the aspirated vapors and oils.