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I'm a new homeowner and went to repair an existing hole in the drywall below our sink (round punched hole in the pictures) and discovered that there's a much larger square hole that was covered by a board (see picture). I only have about 2.5" between the cabinet and the wall making getting tools in there very difficult and there's not access holes in the cabinets in this location. I don't have access from behind either.

I want to seal this off to help stop air flow that's coming through here. Any suggestions of how I might be able to seal this off? I don't care how it it'll look as it's hidden by the cabinets.

Picture of hole with rough measurements Picture of my working area under the cabinet

tifkin
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    Is the air flow too cold? Because if cold air is coming through that hole, then closing the plumbing in with the cold air might cause the plumbing to freeze. If too warm or smelly or something, that would be different. – mdfst13 Oct 28 '23 at 21:26
  • It is cool. I believe the airflow originates from our crawlspace, but traverses some of our wall cavities before getting to here (it's an old house). There's other exposed piping in our crawlspace as well. We thankfully don't have too many freezes(I'm in the Pacific Northwest), but I should probably look into insulation that those then – tifkin Oct 29 '23 at 00:02

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