Mine doesn't quite fully open, either. Not sure why they designed it that way but it continues to work just fine. I doubt there's any difference in the volume of air that is moved one way or the other.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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