[Test-Equipment] HP fans

[Gary Chatters]

As long as someone brought up the 5245L:  One of the problems with
the older HP equipment and even some not so old equipment is the
fan noise.  I would like to leave a frequency counter on for long
periods of time, but it would be difficult to live with the noise.

I am thinking of replacing the stock fan with a quieter muffin 
style fan.  Has anyone tried this and had any problems?
Is there anything critical about the cooling?  My impression is
that you just have to have some air movement.  But to be sure, one
should check the internal temperature.

Gary