Found this in a cabinet under the stove. I think it's old ventilation from before the induction burner was installed. Not sure how to seal it off.
this post was submitted on 05 Jul 2023
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It looks like someone already stuffed it with insulation.
Assuming this is in an unseen location, you don't have to get fancy. You could put a square of plywood over the hole, screw it into place, then caulk the edges. That should cut down on drafts and keep creepy crawlies out.