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You could make the slots smaller or larger and adjust the amount of movement by using a simple mechanical arm that would be configured like so.
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The top line would be the actuator the \ would have a pivot point in the center and the bottom line would be connected to the sliding portion. By adjusting the pivot point and length of the \ you could change the amount of movement for opening the grill. (Ignore the .. it was used for spacing since I can't create an image now at work.)
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