I just discovered that you can get screens that fit the front windows of your Sprinter so you can let air in and keep bugs out. A company called Breezeway makes screens for trucks. Go to a Flying-J and buy Breezeway #1, a set of two screens for $25. Each screen has a flap on the side with the letters FPIGC. Cut the flap along the FP line and voila, you have screens. Unfortunately they fit at a slight angle, which leaves wedge-shaped open spaces at two corners. Just get some plastic and cut wedge-shaped pieces that will cover the open spaces, and superglue these pieces to the edge of the screen.
