im not actually touching the fan, im putting a hole in the ps4's outer shell thats directly over/under the internal fans location and fitting an 80mm filter on said location, so instead of the ps4 circulating hotter air, there will be cooler air coming in from outside of it.
i have done fan mods before , 1 on my current ps3 and some to a couple of 360's in the past, i know i have to be cautious.