A filter cartridge (1, 301, 401) comprising: (a) a media pack (2, 302, 402) including media (2, 302, 402m) and having a first end (3, 303, 403); (b) a first end piece (8, 308, 408) having a central aperture (10, 310, 410) therethrough and an end of the media pack embedded therein; the end piece comprising: (i) an end cap section adjacent the media pack first end; and, (ii) a seal support section (20, 320, 420) defining a seal recess; the seal support section projecting away from the media pack; and, the seal support section defining a seal support wall (120, 320, 420) that has a portion that slants radially in a direction of extension away from the end cap section, to define the seal recess; and, (iii) the end cap section and the seal support section being integral with one another; (c) a housing seal member (16, 316, 416) non-removably secured within the seal recess and configured to form a radially directed seal with a housing component, when the filter cartridge is installed for use; (d) the seal support having a seal support wall that surrounds the seal recess; (e) the seal support wall slants radially inwardly in extension away from the end cap section; and, (f) the housing seal member is configured to form a radially inwardly directed seal with a housing component, when the filter cartridge is installed for use. (a) a media pack (2, 302, 402) including media (2, 302, 402m) and having a first end (3, 303, 403); (b) a first end piece (8, 308, 408) having a central aperture (10, 310, 410) therethrough and an end of the media pack embedded therein; the end piece comprising: (i) an end cap section adjacent the media pack first end; and, (ii) a seal support section (20, 320, 420) defining a seal recess; the seal support section projecting away from the media pack; and, the seal support section defining a seal support wall (120, 320, 420) that has a portion that slants radially in a direction of extension away from the end cap section, to define the seal recess; and, (iii) the end cap section and the seal support section being integral with one another; (i) an end cap section adjacent the media pack first end; and, (ii) a seal support section (20, 320, 420) defining a seal recess; the seal support section projecting away from the media pack; and, the seal support section defining a seal support wall (120, 320, 420) that has a portion that slants radially in a direction of extension away from the end cap section, to define the seal recess; and, the seal support section projecting away from the media pack; and, the seal support section defining a seal support wall (120, 320, 420) that has a portion that slants radially in a direction of extension away from the end cap section, to define the seal recess; and, (iii) the end cap section and the seal support section being integral with one another; (c) a housing seal member (16, 316, 416) non-removably secured within the seal recess and configured to form a radially directed seal with a housing component, when the filter cartridge is installed for use; (d) the seal support having a seal support wall that surrounds the seal recess; (e) the seal support wall slants radially inwardly in extension away from the end cap section; and, (f) the housing seal member is configured to form a radially inwardly directed seal with a housing component, when the filter cartridge is installed for use.