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One issue with the continuous air vent

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(I'm mostly joking with this, but I bet it could work nonetheless...)

Get some 3/4" diameter foam "backer rod", spray paint or plastidip it black so it's not as visually noticeable, and then just shove it in there to block the vents.

Just for s***s and giggles, I just tried it with some 5/8" diameter backer rod that I had laying around, and the diameter was a bit too small to fit snugly, but it still generally worked to block or reduce air flow. I'm guessing 3/4" would be about the right size. Otherwise, I'm sure there are numerous other foam products that could fit the bill.

Sika 3/4 in. Closed Cell Backer Rod-108130 - The Home Depot

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