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I personally think a small fern growing in an orchid pot full of moss might help things by sucking water out faster, so the moss opens up air spaces faster. But others here seem to disagree.
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I think the major issue is that fern roots spread through the medium and it get hard to take them out without damaging orchid roots.
I have two small cymbidiums in the same pot and pulled out a small fern from it, maybe 3 inch tall. The rhizome was 4 inch long and 0.4 inch in diameter. And this was only the main part of the root system.
I can imagine what it can do in a small pot.
But thinking about its role in controling water in the pot I agree, it's a good solution and also a good indicator of lack of water.
bigger fans can spin more slowly and still move more air (because of their size) than smaller fans. These move 110 cubic feet of air per minute while spinning slowly at 700rpm (smaller fans run at around 1200rpm or more) and is thus very quiet at 19db - 25-30db is a whisper quiet library if that helps?
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