A flammable material will burn only when the air contains a sufficient concentration of it. Not only is this an underlying principle of the Chapter 5 requirements for hazardous locations, it's a key principle to apply when working near, or with, flammable materials.
Here are some tips to follow when working around flammables:
If you're the one using a flammable material, read the label and the MSDS. Understand the heat limits, ventilation requirements, and PPE requirements. If the correct PPE isn't available, don't use the flammable material.
Don't mix flammable chemicals with other chemicals. Doing so can increase the fire hazard and/or create toxic vapors.
Before bringing flammables into an area, find and remove all ignition sources. This may require lockout/tagout. There's no such thing, for example, as "just a little" hexane when you bring a container of it near an ignition source.
If you must use a flammable solvent in a battery room, do the cleaning immediately and remove the container when done.