make sure you check both filters, there are two pollen filters behind the glove box that are to be replaced at each A or B service and the single charcoal filter in your picture under the dash near the blower. the charcoal is supposed to be done every 4 years or 45,000 miles whichever comes first.
send me an email and i will send you the mercedes e sheet for your car, it gives some info on what gets done and when.
hope this was helpful Ray
mercedessd@cox.net