Old air vent holder opener
thingiverse
I've got some old air vents in my house that aren't getting much use. The one in my spare bedroom/office has a busted opener, so I can't prop it open with ease. So, I whipped this up quick. By latching onto either the top or bottom vent rung (turning it 180 degrees), you've got plenty of options to fine-tune how wide open you want your vent to be.
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