Replacing Air Filters on J2350 Routers

The cooling fans on J2350 routers draw air through vents along the left side of the chassis and exhaust it through vents on the right side of the chassis. For more information, see J2320 and J2350 Cooling System.

On J2350 routers that comply with Network Equipment Building System (NEBS) criteria, the air intake grid contains a filter. To verify that the system is a NEBS-compliant system, run the show chassis hardware command. A NEBS-compliant system displays the term NEBS in the output.

We recommend changing the filter every 6 months. However, the optimal filter replacement interval can vary depending on the environment where the router is located. If temperature alarms appear, inspect the air filter.

To replace the air filter:

1. Loosen the filter tray thumbscrew at the rear of the J2350 chassis.
2. Hold the screw firmly and pull it away from the chassis until you have pulled the attached filter tray out of the chassis (see Figure 99).

   Figure 99: Removing the Air Filter Tray

   

3. Hook-and-loop fasteners on the base of the filter tray hold the air filter inside the tray. Grasp the air filter with your fingers and gently pull it away from the filter tray.
4. Set the old air filter aside.
5. Place the new filter so that its edge aligns with the first hook-and-loop fastener as shown Figure 100.

   Figure 100: Placing the Air Filter on the Air Filter Tray

   

6. Press down on the filter until it is firmly seated against the bottom of the tray.
7. Hold the filter tray with the thumbscrew so that its sheet metal side faces the power supply fan exhaust. The air filter tray is designed to prevent it from being inserted incorrectly (see Figure 101).

   Figure 101: Inserting the Air Filter Tray on J2350 Routers

   

8. Slide the tray fully into the air filter opening.
9. Tighten the thumbscrew to the chassis.