[Christ]

Or... it looks like you've taped it to the windshield. Not likely that you'll see rain/snow, eh?

Either way, just tape something about 1/2" thick to the windshield to keep the whatever you're using away from the windshield all the way around, and that should give you enough room for the ventilation. You'll likely lose the pressure feed that you normally would get, though.

(Where you feel air while you're just driving down the road, if you get that. Many people do.)