We do have units in production environments that run multiple shifts. I have noticed when I run a program the last over for five hours that the LCD back does get a little dark from heat. However, they steal continue to function so I don't believe that it is an issue.
Also, the LCD is in the same chamber at the ventilation and access holes are remote from each other so I don't think there is much he transfer from the motor compartment to the LCD.
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