Patent ID: 7857974

Claim:
A filter cartridge, comprising: an outer filter that includes first filter media, a first end plate connected to an end of the first filter media, and a second end plate connected to an opposite end of the first filter media, the outer filter including a central axis; an inner filter that includes second filter media, a first end plate connected to an end of the second filter media, and a second end plate connected to an opposite end of the second filter media, wherein the inner filter is sized to at least partially fit within the outer filter; and a snap fit connection mechanism interconnecting the inner filter and the outer filter, wherein the snap fit connection mechanism includes a plurality of flexible arms extending from the second end plate of the inner filter, and the second end plate of the outer filter includes a hole and a ledge, and the flexible arms of the inner filter are received in the hole and are supported by the ledge of the outer filter.