Specifications

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Cisco ONS 15454 Troubleshooting and Maintenance Guide

November 2001

Chapter 3 Maintenance

Air Filter Inspection and Replacement

3.1.1 Reusable Air Filter

The reusable filter is made of a gray, open-cell, polyurethane foam that is specially coated to provide fire

and fungi resistance. NEBS 3E and later versions of the ONS 15454 use a reusable air filter. Figure 3-1

illustrates a reusable fan-tray air filter in an external filter bracket. When the filter is dirty, remove the

filter and clean it by either vacuuming the filter or running water through it. Because the filter material

is delicate, only a very low-power vacuum should be used. If you are cleaning with water, make sure the

filter is completely dry (dry time is at least eight hours) before replacing it in the fan-tray assembly.

Spare filters should be kept in stock.

Figure 3-1 A reusable fan-tray air filter in an external filter bracket

Procedure: Inspect and Clean the Reusable Air Filter

Step 1 If the air filter is installed in the external filter brackets, slide the filter out of the brackets while being

careful not to dislodge any dust that may have collected on the filter and proceed to Step 3. If the filter

is installed beneath the fan tray and not in the external filter brackets, open the ONS 15454 door and fold

out the retractable handles at each outside edge of the fan tray.

Step 2 Slide the fan-tray assembly out of the shelf assembly by gently pulling the handles.

Step 3 Visually inspect the air filter material for dirt and dust.

Step 4 If the reusable air filter contains a concentration of dirt and dust, either vacuum the filter or wash the

filter under a faucet with a light detergent.

Note If possible, cleaning should take place outside the operating environment to avoid releasing

dirt and dust near the equipment.

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Fan tray filter