ADSORBENT BREATHER Disk Drive The Adsorbent Breather Assembly (ABA) integrates a breather filter, adsorbent pouch filter and a diffusion channel into a single filter assembly. A pressure-sensitive adhesive label secures the filter over the breather hole The ABA is designed to provide protection from particles, hydrocarbons, acid gases, and the effect of water vapor, such as condensation and corrosion. The filtration membrane removes particles from incoming air. The adsorbent element is specially formulated to control humidity and to adsorb acid gases and hydrocarbons from internal and external sources. The integral diffusion channel reduces the amount of hydrocarbons, water vapor, and acid gases entering the drive from the surrounding environment and thereby extending the life of the adsorbent. The most common adsorbents and their associated functions are as follows: • Activated Carbon: Relative humidity control and adsorption of hydrocarbons • Chemically Treated Activated Carbon: Relative humidity control and adsorption of acid gases and hydrocarbons • Silica Gel: Relative humidity control The ABA is located on the inside of the drive. The filter location should be in a low pressure area of the drive so that air can enter through the breather. Generally, the best location is on the cover or the base casting as close as Adsorbent Material Plastic Body PTFE Membrane Diffusion Channel Drive Cover or Base

ADSORBENT BREATHER ASSEMBLY (ABA) PRODUCT GUIDELINES AND SPECIFICATIONS Contamination Control Designed to pass the most stringent cleanliness specifications. Manufactured in a cleanroom environment DONALDSON CHEMICAL BREAKTHROUGH TEST An example of a typical chemical breakthrough graph of an ABA. Actual results vary depending on overall filter size, adsorbent type, and quantity. ABAs are designed to meet customer specifications. Contact Donaldson today for more information! Disk Drive Adsorbent Breather Assembly (07/10) © 2010 Donaldson Company. All Rights Reserved. Information in this document...