MTS FlexTest Models 200 - Manual (Page 290)

MTS FlexTest® Models 40/60/100/200 Controller Hardware
Chassis Maintenance
Troubleshooting and Maintenance 290
An improperly installed chassis filter will not filter the air properly. This
can result in excessive amounts of dust and debris on the inside of the
controller.
Excessive amounts of dust and debris on the inside of the controller
can result in an over-temp condition.
Install the filter so that the arrow on the side of the filter points in the direction
of air flow through the chassis.
CAUTION