Dust filter for ASIC?

Anyone using and can recommend a good dust filter for the inlet fans on ASIC?
Or will this block the airflow to much?

I am in the process of building this. The surface are on the fans is small, so I will build a filter box, and get sheet style filter media and Velcro it onto the intake box. 10 miners will be filtered this way.
I saw a friend use one of those 3d printed 8 inch manifolds for this purpose. He then made a long tubular filter from the media with a stapler A rubber band held the tube filter onto it. He went two months in a dusty environment before it started retracting (getting dirty) The longer you make it, the longer you wait to change it. His was 4 ft.

:+1:
Please give us a picture when you are done.