Note by Rhodium: Distillation of nitromethane at atmospherical pressure is not inherently dangerous as long as you aren't distilling it all to dryness. It is not practical to vacuum distill nitromethane, as there are too big losses occuring down the drain (using an aspirator as vacuum) or into your pump oil.
From dr.drools writeup
Flashpoint - definition
The flashpoint is the lowest temperature, at atmospheric pressure at which a liquid gives off so much combustible vapour at the liquid surface that this vapour, when mixed intimately with air, can be ignited by a flame or spark.
This says no sparks or open fire. Somehow this applies for always for a laboratory and even for a meth kitchen regarding the acetone vapours. But sounds impressing:
"flash point"
flashpoints:
diethylether: -40
acetone: -20
THF: -20
toluene: +6
ethylene glycol: +111
There is a difference between informational warning and steering irrational fears.