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There was a Ford car from the 70's which had a normal grille with horizontal slats which achieved the same result with no moving parts.
The slats were shaped like an aerofoil / teardrop shape in profile. At slow speeds the air went through the openings but at higher speeds the shape sent air over the grille slats and over the bonnet / hood.
The material was a simple injection molded plastic and at a quick glance it wasn't even visible but the shape could clearly be felt with your fingers.
Pete.
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