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My guess would be whichever gives the most direct path to the radiator itself. That suggests closing off the sides.
Rather than a flat plate, a curved panel that bellmouths the radiator's opening would improve air flow if there's any way.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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