Expander inlet guide vanes.
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Previously:
https://www.homemadetools.net/forum/...810#post133351
https://www.homemadetools.net/forum/...512#post101742
https://www.homemadetools.net/forum/...504#post151252
https://www.homemadetools.net/forum/...994#post156992
https://www.homemadetools.net/forum/...329#post158092