Don`t make the pre-filter too hard to access and change ,as it will get dirty pretty quick (of course depends on use and rocket size) and check the fan blades and motor after long use ,as they will get coated in dry paint particles over time ,filter or not.
Also change filters often ,as performance will decrease pretty fast when clogged.
Although my booth has a sealed/rated explosion proof fan seperate from the booth ,you should be OK ,as the chance of paint/VOC fume explosion are pretty slim (things have to be just right ) but it`s still a good idea to have a good fire extinguisher handy.
ROCKETRY DELINQUENT ,I put my soul in what I do.
I built a rocket, and on the seventh day ,I rested
Manitoba Rocketry Group
CTI a better way to fly !