Importance

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Abstract

A filter cartridge 12 that includes a filter material 42, an end-of-service-life-indicator (ESLI) 40, a housing 22, a cover 24, and a window 38. The filter material 42 has first and second major surfaces 45, 47 and is disposed in the housing such that the second major surface 47 of the filter material is located downstream to the first major surface 45. The housing has a sidewall 26 through which the ESLI 40 can be seen. The cover 24 is secured to the housing 22 and has an opaque extension 36 that masks at least a portion of the housing sidewall 26. The window 38 is positioned on the extension 36 at a registration position where the ESLI 40 can be seen through the window 38 such that a change in a certain color of the ESLI 40 indicates that the cartridge 12 needs to be replaced. The use of the cartridge cover to provide the ESLI registration position allows the filter cartridges to be mass assembled without risk of error in achieving proper window registration.

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First Claim