I usually like it to be pushed out. But I think its the same effect in either case. If it pulls in, it pulls in dry air and humid air goes out one way. If you push out, then humid air gets pushed out, but dry air gets pulled in. So its basically the same thing.
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"Kings made tombs more splendid then the houses of the living. And counted the old names of their descent dearer than the names of their sons."
-J.R.R. Tolkien
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