A little weak but otherwise well

In order to master the dust in my case, I bought some of these filters. The charm: they are flat and magnetic, and you do not need screws. For cleaning it can then also lose weight easily. The disadvantage. The magnets are too lax a little for my taste and could be a bit more stronger. So you always have to see if the filter still maintain or even dropped (eg after having moved the PC). For this defect, there is a star deduction.