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That looks like a worst case. With some internal bracing you might fish sheets of insulation in the gap.
It looks loke the best bet might be to take the hood off, turn it over, pour expanding foam in the cavity and scrape off the excess,
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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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