National Instruments NI PXIe-1075 - Manual (Page 24)

Chapter 2 Installation and Configuration
NI PXIe-1075 User Manual 2-4 ni.com
Figure 2-2. NI PXIe-1075 Vents
Chassis Ambient Temperature Definition
The chassis fan control system uses intake air temperature as the input for
controlling fan speeds when in Auto Fan Speed mode. Because of this, the
chassis ambient temperature is defined as the temperature that exists just
outside of the fan intake vents on the rear of the chassis. Note that this
temperature may be higher than ambient room temperature depending on
the surrounding equipment and/or blockages present. It is the user’s
1 Primary Air Exhaust Vent
2 Air Filter
3 Primary Air Intake Vent
3 Secondary Air Intake/Exhaust Vents
(both sides)
3
4
1
2