Engine bay part missing?

Hi all, I was replacing the air filter on my 04 Scenic 1.9dci and noticed that I could clearly see the interior fan assembly. I am assuming there should be a cover or plate for this as it makes no sense to have a cabin filter if there is a gaping hole where the fan can draw air in.



Anyone advise if I am missing something as I suspect?



Perhaps someone could post a pic of what they can see behind the air filter housing?



Many thanks