Jay

I think this is an example of do what I say but not what I do. My garage is active, door is opened several times a day and car in... car out... is happening. This gives a bit of air flow and I have not had any problems in the past. My trees are somewhat seperated and there is air coming in through the (leaky) window. That said, you should have a small fan to move the air. You can get them at a Radio Shack or equal. Small little computer type fan. You do not need to make much air flow, actually if you have large amounts of air you will dry out the trees. You are looking to just have a minimum of air flow, I might even direct the airflow over the top of the trees.

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A Bonsai student living with his trees at N 44.37 W 77.49...
Think before you act... then think again... no good comes from rushing