Flex System Carrier-Grade chassis - Replacing the filter media

Use these instructions to remove and replace the dust filters in the airborne contaminant filter assembly and 1U filter retainer. You can replace the dust filters while the chassis is powered on.

The airborne contaminant filters are a consumable part. It is not covered under the terms of the warranty. Use Table 1 as a guide to help you determine when to replace the filter media in the filter assembly.

Table 1. Suggested inspection and replacement intervals
Environment	Visually inspect and clean	Replace filter
Low dust, low foot traffic	3 months	6 months
Moderate dust, moderate foot traffic	6 weeks	3 months
Heavy dust, heavy foot traffic	2 weeks	1 month

Note: The Chassis Management Module web interface supports an air filter reminder that sends an event message to the CMM event log when the filter media needs to be replaced. See ../com.lenovo.acc.cmm.doc/cmm_ui_setting_airfilter_reminder.html for more information.

Both the 10U and 1U filters are made of a premium quality flame-retardant reticulated filter foam. The filters meet the Underwriters Laboratories Inc. flame class of UL94 HF-1 (UL file number E93229). This filter foam also meets the European RoHS standard.

Table 2. Filter media specifications
Color: Black	Base material: Polyether, polyester blend
Density (approximate): 2 - 3.2 lbs/ft³	Tensile strength, minimum: 22 psi
Tear strength, minimum: 4.5 lbs/inch	Elongation, minimum % to break: 200
Cell count: 10 - 100 ppi	Reticulation: Thermal (zapped)
Thickness range: 0.15 - 1.0 inches	Flammability rating: UL94, HF-1
Temperature range: -40°F to +284°F	Dust filter replacement pack part number 43W9057 (includes four 10U filters and four 1U filters)

Attention: Do not clean and reuse the dust filters. You must discard contaminated filters and replace with new filters.

Complete the following steps to replace the airborne contaminant filter media:

Replace the 10U dust filter in the airborne contaminant filter assembly.
1. Remove the airborne contaminant filter assembly bezel from the chassis (see Removing the airborne contaminant filter assembly).
  Note: Remove the filter assembly bezel only. Do not remove the filter assembly mounting brackets.
2. Push down on the slide latches on both sides of the filter assembly.
3. Rotate the filter assembly down and remove the hooks from the slots.
4. Turn the blue filter retainer clips to the open position and remove the filter retainer and filter.
5. Discard the old 10U filter and place a new filter on the filter assembly.
6. Place the bottom of the filter retainer behind the alignment features on the bottom of the filter bezel.
7. Rotate the filter retainer onto the filter and close the blue filter retainer clips by rotating them down to secure the filter retainer to the filter assembly bezel.
8. Install the airborne contaminant filter assembly bezel on the chassis (see Replacing the airborne contaminant filter assembly).
Replace the 1U dust filter located behind the 1U bezel.
1. Remove the 1U bezel from the chassis (see Removing the 1U bezel).
2. Remove the 1U filter retainer from the chassis (see Removing the 1U filter retainer).
3. Pull the dust filter out of the 1U filter retainer and discard it.
4. Place the 1U filter retainer on a flat surface with the extensions up. Place a new filter over the retainer extensions and slide it down into the retainer. Bend the filter slightly and tuck the filter edges under the tabs on the filter retainer; then, press the filter edges all the way into the retainer.
5. Install the 1U filter retainer in the chassis (see Replacing the 1U filter retainer).
6. Install the 1U bezel on the chassis (see Replacing the 1U bezel).