You can get a gauze fabric at like 60p&#x2F;m. You could make a nice recessed frame to hold it and hide the edge. There&#x27;s tables online of particle size so you can pick a mesh size.<p>Got some to use over windows and air vents. Works great and so cheap it&#x27;s just replaced instead of cleaned. Airflow on the finer sizes would be interesting. Mines a spider guard.