If you read the previous post here, I upgraded my PC's filters to 3m aircon filters.
After around 3 weeks, I noted that the filter is getting pretty dusty. Checking the fan's exhaust, it is getting pretty weak. But checking the aluminum filter behind the 3m filter and checking the fan blades, I noted that they are pretty clean.
So I can conclude that
1. 3m filters really work well, even fine dust is captured. Excellent!
2. my room is very dusty
3. looks like I need to replace my filters every 3 weeks or so
4. since finer dust is captured, the 3m filters last much shorter than cheaper aircon filters
For my next test, I will try using pantyhose. You'll see it in soon in a new blog post.
note: added conclusion #4