weasy BLIZZ900 Manuel D'instructions page 9

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Insert the air exhaust hose into the window sealing plate, adjust opening width
of window so that the window can match with the sealing plate properly; length of the
sealing plate is adjustable.
Incorrect installation
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It's important to keep the exhaust duct smooth. Incorrect installation will affect
work of the A/C.
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Prevent the exhaust duct from seriously bending.
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Ensure air can flow smoothly in the duct.
Warning:
The exhaust duct is designed especially for this model. Don't replace or lengthen it;
otherwise, it will result in failure.
Notice:
Max. developed length of the exhaust duct is 1,500mm. It's better to shorten it while use
and keep it horizontal while installation.