Thanks all for your advice.
QUOTE(WebWalker @ May 26 2009, 04:06 PM)
Install the dust filter for the side cover fan (the front fan is already having a filter).
CM 690 is good for airflow, but it also attract dust. It is quite norm ...
Try to clean your case once every month (which I am doing right now).
Hmm how do u clean it ? Dismantle everything and wash it with water ? How about the dust on the mobo and GPU ?
QUOTE(Sib @ May 26 2009, 06:50 PM)
there's no effective way to reduce the dust effectively i'm afraid.
all u can do is to clean it regularly. the fastest way is by blowing it. don't use vacuum when ur cleaning the mobo, gc or any electrical/electronic parts as static might damage the components (diodes, chips etc).
i'm oso using the same casing, 7 90cfm fans inside running. with or without the filter in a week or 2, a thin layer of dust is alr visible inside.

Hmm yea less than a month i can already see dust. By blowing it you mean using a hairdryer ?
QUOTE(fadhfuad @ May 26 2009, 06:55 PM)
Find a thin sponge to cover the top just like the ones provided for the front cover. Then use a filter or DIY filter (pantyhose) for all the fans.
Where can i buy filters in Penang ? Oooh the pantyhose idea is good ! I'll give it a try if i cant find the filters.