Anderson Window Vent Tubes

Can anyone tell me what I am supposed to do with the Vent Tubes on the Anderson Windows I bought?
I got talked into ordering the windows (400 series) with Vent Tubes since they were going to travel over the rocky mountains. I was told that I need to crimp them or something.
Anderson's install instructions leave a little to be desired and don't describe anything about the vent tubes. I have a window with a sticker on it that says "Vent Tubes" with arrows pointing to one side of the window. Yet I see nothing :-).
Thanks for any information y'all may have! Joel
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snipped-for-privacy@ourstillwaters.org wrote:

Looked at Andersen's site for the 400 window series and didn't find much useful, either. My suggestion is to contact the vendor first assuming they're somebody other than a catalog front or Andersen directly.
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