Nah, it won't damage it, the worst that will happen is that your
PSU fan comes on quicker under load.
For most of the time, the air that comes off the
TRUE is only a bit warm anyway.
You could always fit a different
NB cooler and then you could fit the
TRUE, or you could file some off the
NB cooler so that the heatpipes from the
TRUE don't catch on it.