Control Your Computer's Fan Speed The objective of this question is to create a program that pushes your computer's internal fan speed to its maximum RPM.  Upon exiting the program, your fan should return to the normal operating RPM.

Rules:


You may not perform a CPU intensive task in order to modify the
fan's speed.
Exiting the program may be via user input, a timeout period, or a response to a SIGTERM or SIGEXIT signal.
Avoid the standard loopholes.
OSX + Bash + smcFanControl, 91 bytes
This relies on the third-party smcFanControl suite to do the hard work and is therefore more of a proof-of-concept than a serious answer.  Real answers could pick apart the smcFanControl source code and do this without third-party help.
smcFanControl.app is assumed to be installed in /Applications.
p=/Ap*/smcFan*/C*/R*/smc\ -k # Path to CLI utility
f()($p'FS! ' -w000$1)        # function to set fan mode
f 3                          # Set fan speeds to &quot;forced&quot; mode
eval $p\ F{0,1}&quot;Tg -w5DC0;&quot;  # Set fan 1 and 2 to 6000 RPM target speed
read                         # wait for keyboard input
f 0                          # Return fans to &quot;auto&quot; mode

Comments added for explanation, but not included in score.