One can't expect a 100+ CFM fan to run silently at full speed. You just have to choose your poison on the quality of the noise. If the noise is in a frequency range that irritates you, there's not much to be done about it. If the noise is acceptable without grilles or filters, then you'll just not have to use grills or filters. Take the Doctor's advice: "If it hurts when you do that, then stop doing that..."
. My Y720 fans (in the FS/T listing linked below) are tolerable to me at full speed (but apparently they don't generate a full 100 CFM at full speed either), but they might seem like "screaming meemies" to you.
. Generally, to get anything like 100+ CFM without a lot of noise takes 38mm thick fans or those 250mm giants, both of which may not fit in some cases.
.bh.