This is quite interesting, which fan size you used and which model, is it very noisy?
I will add this to my Inspiron 570 upgrade guide as addition for extra airflow, since the case is the same. I did not cut my case before, but mounted two 80mm fans from inside (improved a bit, but not significantly, anyway it was better than nothing). I managed to insert 2 80mm fans from inside of the front panel around on/off switch, those fans came from the old parts bin, pictures below shown 2 70mm fans, which I removed due to excessive noise. 80mm fans were mounted using 3 screws for 1 and I think only 2 screws for another (look at red markings), but holding tight, no vibration, here we go:
Front view
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View from inside, actual shown are 70mm fans, which already replaced with 80mm (not shown):
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Inside intake fan lower below:
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So, you done very well and thank you for posting.
