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So the heating element inside the tube would gently warm the air/area within the tube, above the mirror, and the fans push said warm air up the tube in order to stop the ingress of dew into the tube? I don't see why that wouldn't work? although the same issue with regards to thermal currents still apply I would think, probably to a lesser degree, as the mirror may well reach ambient temps, and you may not suffer the boundary layer of warm air associated with heating the mirror itself...
I've seen a photo on the forums somewhere.. Someone wrapped a dew heater band around the outside of the OTA 2~3 inches further up than the mirror... I think it was in the "Show us your equipment" thread... I suppose his thoughts were the same, although, implemented in a much less efficient manner.. Having the heater inside the tube would make it much more efficient I think.. especially if the tube was CF..
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