Reddit reviews AIYUE 120mm Ultra Fine Magnetic Frame PC Fan Dust Filter Dust Filter Fan Filter PC Cooler Filter Black Dustproof Case Cover Computer Mesh Computer Fan Grills 2 Pack
We found 2 Reddit comments about AIYUE 120mm Ultra Fine Magnetic Frame PC Fan Dust Filter Dust Filter Fan Filter PC Cooler Filter Black Dustproof Case Cover Computer Mesh Computer Fan Grills 2 Pack. Here are the top ones, ranked by their Reddit score.
Item Features: Convenient magnetic frame design for easy installationUse for: for the home computer chassis fan dust, speaker speaker grilles and a variety of electrical and electronic products speakers dust protectionDust filter Dimension:120 x 120mm/4.72 x 4.72"(L x W)Design: dust filter fan filter has ultra fine holes, protect you computer from overheating and minimize the noisePackage includes: 2 x Ultra Fine Dust Filters
Remove the top exhaust, leave only the 2x front intake and 1x rear exhaust.
Add ultra-fine fan filters (like the ones used for indoor AC units) under your current filters.
This picture shows the difference between the two types of filters.
Hopefully you'll only have to clean the filters every two weeks or so and the inside of the case should remain clean. Note that if you still find very fine particles of dust inside the case then the only way is to add an air purifier.
Aside from all the other comments, if you don't care much about looks and your case is just wide enough, you could rig another 1-2 120mm or 140mm fans to blow directly towards the blower intake fans, using something like this fan bracket or similar, just to force a bit more air in between the gaps.
Alternatively, cutting out a 120mm or 140mm fan opening on the side panel over the GPUs, and just putting one of those fan filters over the hole on the outside, and the fan on the inner side. Noctua makes a nice 120mm x 15mm slim fan that would do nicely for such a purpose.