Dunno about that Presto one, Sally - I bought my Nesco on Ebay quite a few years ago, the fan is in the base so not sure about the top fan being a must?
If I were to buy a different dehydrator, which is not likely because the one I have pretty much does what I need, the only change I would make would be to get one where you could remove a tray to have more "head room" in between the trays.
I think this one is pretty close to what I have
https://www.kohls.com/product/...
