Ruijie Networks RG-N18014 Hardware Installation And Reference Manual page 86

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Note:
Buttons on plastic cover
 To install the air filter , follow these steps:
1) Seat the air filter in the plastic cover and tighten screws.
2) Install the plastic cover before the air filter by pressing firmly the two buttons on the both sides of the plastic cover.
Figure 3-7 Installing the Air Filter of the Supervisor Module and Service Module on RG-N18010 Switch
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Plastic cover over air filter