I did do quite a bit of research before undertaking this project. The fan motor is outside of the airflow. I will use it for a minute, and then not again for days. I do not mass produce anything. Thanks for your concern.
Pete
From woodcraftmagazine.com
In order for a solvent
explosion to occur it must achieve a certain air/
solvent concentration. This is referred to as the
solvent?s lower explosive limit (LEL). As long as the
fan is operating before you start to spray, a basic
booth will make it almost impossible to achieve
the LEL. Sparks or no sparks, nothing will happen.