Its been a while since I received the filter but am too lazy to put it in. The filter is suppose to be replaced at every 15K km and I'm doing it after 80K km hehehe.
For tutorial on how to replace the Aircond cabin filter for Elantra/Avante X20, you can go here.
Aircond cabin filter.. I believe most of us does not really aware about the existence of the filter and the need to either clean it or replaced it overtime.
Here is the post regarding the filter by a friend of mine..