You will always have problems with dust in any case dust filter will limit the dust intake i own the Air 540 and it comes with air filter for the front but i noticed it gets dust from other ports like the bottom and top of case but Corsair currently has Filters for around $8.99 and problem solved with the case you get 1 filter for the front but need to be-cleaned maybe every 2-3 months because its a high airflow case be dust in the case will be limited but it also comes to the environment the case is in
I was also unhappy about that, there are vendors who can sell you the rest of dust filters aftermarket. In the end I couldn't justify buying a high airflow case that didn't come with adequate protection for my hardware.