From a safety perspective when it comes to ventilation, it is better to have positive ventilation than negative. In essence, have the fan blowing into the workspace, keeping the motor in fresh air, rather than using it to suck the air out which draws the fumes over the motor.
Realize that even if you filter the exhaust side, the fumes from volatile solvents will still be in the exhaust air, and if the prevailing winds are from the exhaust side, it can wrap the fumes back around to the intake fan.
Second, paint overspray/dust can be extremely flammable, so having disposable covers inside that can be easily removed can save you a lot of headaches. If you use plastic sheeting/drapes for this, especially during low humidity conditions, you may want to use a grounding tether attached to your body plus the spray gun to minimize any static discharge. Highly advisable if you are wearing disposable (tyvex) coveralls, etc.