Hi all - saw an ecofan (one of those non-electric, heat driven fans for the top of the stove) online and was somewhat interested, although the price seemed very high. Went to local stoveshop about a week ago and saw one sitting on an operating stove. Couldn't believe how slow the fan was turning and started to wonder if anyone has tried one of these and what they've experienced. If the fan speed I observed was any indicator of performance, the price is DEFINITELY TOO HIGH.