I find It can take a little second for the machine to recognise the air.
What I do is attach the vent directly to the back and leave it a minute, when I come back it’s full. You need to leave an air gap at the back of the machine though.
Sometimes using a pipe that’s too small won’t supply the mininum intake amount, but that’s usually only when filling cauldrons with water. You could try a larger pipe to see if that’s the issue however.
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