>>6157147New hotness.
Lessons learned:
One fan >>>>>> multiple fans
Flexible ducting is a huge dust trap, to be avoided if possible.
>>6156988Timely.
Given where you will be spraying fan placement is questionable. Front or bottom or even side would be better.
Air filter like that will block the airflow and bring the effective CFMs right down. Fiberglass filter is better.
Lighting is HUGELY important, you do not want to half-ass it (unless you want to be running to a proper light every time to check the paint coverage/color).
>it's not the paint you're trying to capture, it's the fumesYou _are_ trying to capture paint dust as well as fumes (unless the area you are planning to use this in is not meant to be habitable).