It won't really affect cooling. it will stop the dust from going in. So in the long run it will help with keeping the dust out and eventually stop dust from blocking fans but right now you wont see any significant change.
thanks a lot for the reply
the mesh net that i will be using will definitely block some air as well
On cabinets the nets are placed right in front of the intake fans but on the PS5, the fan will be 10 cm away from the intake vent
PS5 already has cooling issues (Ram module running near max temps), im being paranoid that my attempt to keep it dust free will backfire