If the dehydrator ever sparks, it might cause a fire. Be careful. It's best not to put large quantities of flammable solvent near anything that might make sparks.
With most dehydrators, the fan and heat source are blowing air over the contents to be dried rather than sucking the air. This means pretty clean air is blowing over the solvent, and the solvent fumes are moving away from the fan and heating elements, not towards them. So in order for a fire to start, a spark must come from the fan or heating elements and shoot out very close to the solvent. In reality, this is not very likely to happen. I've never seen a food dehydrator ever make sparks. Still, the thought of it is scary. A spark in the fan or heater that doesn't shoot out far enough to reach the solvent vapor isn't going to cause a fire, unless the room is filled with solvent vapor and the dehydrator is recycling the vapor through its fan.
This is a scary thing to think about. Definitely don't let it run unwatched. You should have a fire extinguisher ready that's labeled specifically for chemical fires, just in case.
If you use DCM, this isn't a problem because DCM doesn't catch fire.
You may remember me as 69Ron. I was suspended years ago for selling bunk products under false pretenses. I try to sneak back from time to time under different names, but unfortunately, the moderators of the DMT-Nexus are infinitely smarter than I am.
If you see me at the waterpark, please say hello. I'll be the delusional 50 something in the American flag Speedo, oiling up his monster guns while responding to imaginary requests for selfies from invisible teenage girls.