| I might be slightly over generalizing here but I don't think so, others may weigh in if they have opposing opinions, but: the point of providing good air circulation is to simulate the cultural conditions an orchid might find in its natural environment, e.g. mountain breezes, winds across the plains, etc. Air movement does more than just give a plant fresh air, it dries the leaves off or the crown and prevents various types of rot and mold, etc., etc. Many growers that I know have fans blowing on their orchids, I've got 2 bun fans and an oscilating fan for a small area. I personally don't think a relatively small terrarium (such as someone might find in a home) unless it has a fan in it, could provie idealari circulation.
Just one opinion.
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