Is this bad?

So my front panel is glass and the airflow was horrible so I decided to put this in its place it’s cotton and there is no contact with the fan I just want to know if this is a good alternative or if there is something that can go wrong

So my front panel is glass and the airflow was horrible so I decided to put this in its place it’s cotton and there is no contact with the fan I just want to know if this is a good alternative or if there is something that can go wrong