Originally Posted by clickwir
I have em on some of my fans. They really do help. But the dust does go somewhere.... meaning you do have to clean em (least in my place I do) every other month or more if the windows are open.
But the insides are a ton cleaner. Definatly recommend the kits or a simple homemade one.
better outside than in
but then will the filter restrict airflow
specially when its covered with dust