Beware having grilles this close to fan intakes; this will produce a lot of turbulence and noise.
Do these cages have mounts at the rear? If so, you’ll need to seal all gaps between the grille and fan intake to prevent recirculation currents.
I'm going to cut the grill out just leaving the edge and then put a magnetic dust filter over the top - Currently intake is 2x120mm like this atm, and, exit is 3x140s with grills and dust filyers; they're barely audible unless under heavy load.
@spotter started
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Beware having grilles this close to fan intakes; this will produce a lot of turbulence and noise.
Do these cages have mounts at the rear? If so, you’ll need to seal all gaps between the grille and fan intake to prevent recirculation currents.