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I'll be using a low pressure (<0.3 psi at the hole) blower but throttling it before it goes into the drain hole to get the heat of compression and warm the air stream. It's a warm mild breeze into the drain hole but it should dehumidify the transom somewhat over the many hours of running I plan to use. I'll report back when it's done, but it will be hard to tell how effective it actually was.