Quote:
Stuff I can easily source doesn’t handle the vacuum. Would want to get it airtight so it pulls the air only from the basement, other vents are closed or covered to reduce simply sending cold air into the basement directly
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I hadn't commented because the pics could use an UP arrow. Neither pic shows the top end of the hose.
But generally speaking, hose clamps should serial the upper ends, a piece of carpet turned upside down should seal the bottom.
What you want is a [plenum] box that extends the basement vent upward with a venturi around the end of the vent pipe.