@MrKrueger_1752225 is the intention here to filter the exhaust or intake side of the fan? if it's the exhaust I don't see how it's supposed to mount, if it's the intake then isn't dust already inside your case at this stage? Are you trying to negatively pressurise your case? If so is dust getting sucked in via crevices etc you find in most manufactured cases?
Or am I thinking about it the wrong way and it's meant to clip into the backside / internal side of the fan (ergo the fan hole plugs) in a positive pressure orientation, so it's collecting the dust 'inside the fan' so to speak and you just need to be ready to catch or vacuum it up when you release the fan cover?