| 主权项 |
1. A filter cartridge comprising:
(a) media having first and second ends; the media surrounding and defining a central open interior; (b) a first piece positioned at the first end of the media;
(i) the first piece having a central air flow aperture arrangement therethrough; (c) a second, closed, end piece positioned at the second end of the media; and, (d) a housing seal arrangement positioned on the first end piece; the housing seal arrangement comprising a seal projection including:
(i) a first, radially outwardly directed, surface defining a non-circular configuration, in extension around the central air flow aperture arrangement;
(A) the non-circular configuration of the first, radially outwardly directed, surface comprising at least three radially projecting sections, to define a plurality of spaced radially projecting lobes, separated by recesses, in the first, radially outwardly directed, surface as the first, radially outwardly directed, surface extends around the air flow aperture arrangement; and,(ii) a second, radially inwardly directed, surface defining a non-circular configuration, in extension around the central air flow aperture arrangement;
(A) the non-circular configuration of the second, radially inwardly directed, surface comprising at least three radially projecting sections, to define a plurality of spaced radially projecting lobes, separated by recesses, in the second surface as the second surface extends around the air flow aperture;(B) the second surface being positioned on an opposite side of the seal projection from the first surface; and,(iii) at least one of the first surface and the second surface comprises a seal surface. |
