Demciflex filters any good?

I have a 400R case and the right side panel and top of the case have unused mesh areas as I do not need more fans. I am thinking to use Demciflex to stop dust going in the case....it seems to look clean too.

I'd leave the side panel blank and just get one for the top. If you have more intake fans than exhaust then you won't have to worry much about dust going in the side.
 
I'd leave the side panel blank and just get one for the top. If you have more intake fans than exhaust then you won't have to worry much about dust going in the side.
As things stand I have the 2 x 120mm front intake fans and then a 120mm exhaust on the back panel. I am using the Noctua D14 and set it up to be blowing in the same direction as the exhaust fan...it does seem to keep temps really decent like that.
This was my first own build and funny how one becomes attached to the machine then ;)!
So with the above config you reckon just a filter for the top and leave the right side open?
Also, do you think I should replace the 120 exhaust with a 140mm? Will that be better keeping in mind the setup with the D14 fans.
Thanks
 
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