With the active carbon filter 2-piece set, you can upgrade your Zarah, Zola or Zeld extractor hoods in only a few steps to a recirculation mode. This is especially useful if you cannot equip your hood with an exhaust pipe. The active carbon filter quickly & reliably removes annoying kitchen odors from the air that is being passed through, thus ensuring a pleasant atmosphere in the room. In order to perform its work optimally, the filters should be changed regularly.