The hood has been reinstalled and an exhaust air was not possible. What to do? Only on the grease filter I did not want to leave (is made of metal - for easy cleaning to rinse) and the first smell of roasted garlic, for example, did not want to really get out of the kitchen ... (luckily the door :-) Then I installed the immediately matching carbon filter (really simple - like the car the fuel filler cap zuscharuben) and: Bye Knobiduft. So, highly recommended for a deduction Wars in recirculation mode!