Not OP, but own a similarly open-air PC (Thermaltake Core P3).
I bought a Wolfbox MF200 duster on sale off their AliExpress store for ~$50USD; just need to just give it a quick blast every once in a while and it all remains dust free.
Honestly dust management in open frames is significantly less hassle than in closed cases - regardless of positive/negative internal pressure.
Not OP, but own a similarly open-air PC (Thermaltake Core P3).
I bought a Wolfbox MF200 duster on sale off their AliExpress store for ~$50USD; just need to just give it a quick blast every once in a while and it all remains dust free.
Honestly dust management in open frames is significantly less hassle than in closed cases - regardless of positive/negative internal pressure.
This! ๐
It's pretty easy to keep clean, just blow it out once a month or so.