Window screen will not trap any dust or lint, get a cut your own house filter kit Lowes/Hdepot and a louvered vent cover. The filter kit comes with a carbon sheet and a lint/dust batting sheet. The larger the louver the better the airflow. Cut the sheets a tad larger than the cover and screw it to the cab over the sheets. Very easy to change, flows good air and catches fine dust and lint. 10 mins