thanks for the suggestions.. i changed the Thermal paste.. and the fan is a bit more silent.. its noise when its around 4.5k rpm.. higher or lower.. its not noisy.. the cpu fan i mean.. and the following picture would help you determine the airflow.. :S
the back..
http://imageshack.us/photo/my-images/535/backvig.jpg/
the front
http://imageshack.us/photo/my-images/80/frontjr.jpg/
the closed side
http://imageshack.us/photo/my-images/171/closedmc.jpg/
the open side..
http://imageshack.us/photo/my-images/543/openre.jpg/
the gpu.. (no space for airflow.. so opened the available covers. e.g. cd and floppy from front and broke open all the PCI pin covers from back..)
http://imageshack.us/photo/my-images/853/gpuo.jpg/
only fans.. (i got three fans.. one cpu (blowing out) another is the SMPS blowing out and the third one is the case fan also blowing out..)
http://imageshack.us/photo/my-images/843/onlyfans.jpg/
so practically there is no air in fan.. btw i live in India.. pretty warm country..
the state of
Andhra Pradesh and city of Hyderabad.. helps you to know the current weather (temperature) of the city..