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I thought about using 2 grilles with one inch slots against each other. One grille would be fixed and the other would slide. When the slots are lined up you get plenty of air in, and when you offset it one inch you get a total grille block. I thought I could simply mount a couple of power lock actuators and trigger the opening of the grille with the rad fan. I don't know if the power lock actuators would be strong enough to make the grille move at speed, but they are so cheap I've got to try.
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