I don't think so, I have an excaliber food dehydrator on my counter and the fan on it looks very much like a standard PC case fan.
Probably true... but it sounds like strangeloop is talking about a bigger unit otherwise it would be kind of an overkill to have four temperature sensors in something you could put on your counter. Since it is solar, I still think it is a good idea to look into convection airflow. That way the only thing consuming power would be the data logger.