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I've had an Anova 800w for a couple years and love it. Here around Christmas Anova had the nano for $65 shipped. Picked one up for the heck of it and so far it has been pretty impressive.
I guess it's possible, when I have dried peppers in the oven and open the door to check on them and get a little close too soon it will clear out your sinuses. And that was at 170 deg.
I always cut meatier peppers like jalapenos or habaneros in half lengthwise before I dry or chipotle them, they dry so much faster. Lay cut side up to keep all the seeds.
They freeze really well. Whole or halved and gutted. I do cowboy candy, jalapeno jelly, escabeche, chipotle, and a pickled jalapenos and carrots (I'll have to dig that recipe out and post it), just to name a few