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Originally Posted by Bud
I think its partialy due to the fact that heat rises, so as to help with hot spots. I could be wrong...just a thought
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bingo. thats it in a nut shell. the fan will cause the hot air to circulate to evenly heat the oven and prevent hot spots. on a normal kitchen oven the engineers that design them factor a lot of stuff into design so that even heating is possible without a fan. but when going with a home built a fan is a great asset, not required but you will be happier with the uniform heat with a fan installed.