When I set the air flow to just be down at my feet I get almost nothing emitted from the foot well area. Almost all the air flow is directed to the rear passengers via their vent. If I close theirs I hear a lot of back pressure and whistling like the air can't escape. Should I get this checked? I run the fan at high. Also when I direct air to the face and also front windscreen together I get minimal air to the face I have to just have the face only to get much air flow. What do others experience? Does the ZB have a cabin filter? And what about a pollen filter?