By the way I just got two from
Coralife 3-1/8" Cooling Fan Kit and they are so quiet you cannot hear them! I moved from same sized PC fans to these which move a bit less air (in my opinion) and they are really worth every penny!
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)