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I cannot imagine not having a fan! My TVbator was TERRIBLE until I added the fan! There were spots near the heating element that would get to 110 and the spots farther away that would be 93 degrees. Of course, your hovabator was designed to be a still air machine and should circulate pretty well especially with a couple of the vent plugs open.
I also think that the "fan kit" being priced at $30 +/- is wrong! If anybody needs help adding a fan to an incubator, please pm me and I will walk you through adding a fan to ANY incubator for a cost of $5 or less! My fan came from a thrift store for 3.99. There are fans in everything! Of course, if price is not a concern, most places sell new fans for 20-30 dollars, but I prefer to recycle old parts and they are often better made and last longer than new "made in China" stuff that can be bought nowadays.
(note: I do NOT have any fans for sale, I will just point you in the right direction and give you free advice on where to look, what to use and how to wire)