The model picured there is a Bosch ventless condenser dry machine, which must also have the condenser periodically cleaned. It pulls out from the front, behind a hatch on the lower left.
I figured this was a ventless dryer, as the standard heated kind basically never fail to dry things if you just clean the lint trap. And I even used one at someone's apartment that had clearly never been cleaned but it still dried after twice the usual duration. I took it apart for them and pulled out two garbage bags full of lint... I still can't believe that hadn't caught fire on them.
It depends on how full you stuff the dryer and how large the pieces are. I sometimes have issues with bed sheets, when they hug each other into an undryable ball. My dryer won't even start when it detects the air flow is impaired.