An air cleaner assembly comprising: (a) a housing having an air inlet and an axial air outlet, the housing having an outer housing sidevall, the sidewall having first and second opposite ends; (i) the first end is closed by a cover; (ii) the second end is closed by an end cover; (b) a primary filter cartridge; the filter cartridge comprising: (i) first and second, opposite, ends; the first end having an air flow exit aperture therethrough; filter media extending between the first and second ends and circumscribing a central clean air volume; and, (c) wherein inner support for the media is provided by structure not mounted on and not provided as an Inseparable part of the primary filter cartridge; the support extending between first and second opposite ends (80, 81) of the support and being secured to the housing, characterized by: (d) the support comprising a framework and being at least 50% open in extension between the first and second opposite ends of said support; (e) further characterized by a radial seal on an external portion of the primary filter cartridge, around its first end; and wherein (f) the support has an even taper and decrease in diameter between the first and second ends (80,81) of the support with the largest diameter being adjacent the first end; (g) the second end of the support is a closed end remote from the 30 housing first end; (h) the first end of the support is an open end adjacent the housing first end in axial alignment with the air outlet; (i) the primary filter cartridge is removably positioned over the support with the radial seal removably sealed to the housing: further characterized by (j) a shield on the end cover surrounding the second end of the primary filter cartridge; the shield being arranged such that air, carrying particles, is prevented from immediately impacting the filter media in the filter cartridge before spiralling occurs; (k) the side air flow inlet being a tangential inlet; the air inlet being adjacent the housing second end; the primary filter cartridge comprising a conical extension of media with the largest diameter adjacent the first end of the primary filter cartridge; and, (m) the housing including a dust drop tube therein, said dust drop tube being adjacent the housing first end. (a) a housing having an air inlet and an axial air outlet, the housing having an outer housing sidevall, the sidewall having first and second opposite ends; (i) the first end is closed by a cover; (ii) the second end is closed by an end cover; (i) the first end is closed by a cover; (ii) the second end is closed by an end cover; (b) a primary filter cartridge; the filter cartridge comprising: (i) first and second, opposite, ends; the first end having an air flow exit aperture therethrough; filter media extending between the first and second ends and circumscribing a central clean air volume; and, (i) first and second, opposite, ends; the first end having an air flow exit aperture therethrough; the first end having an air flow exit aperture therethrough; filter media extending between the first and second ends and circumscribing a central clean air volume; and, (c) wherein inner support for the media is provided by structure not mounted on and not provided as an Inseparable part of the primary filter cartridge; the support extending between first and second opposite ends (80, 81) of the support and being secured to the housing, (d) the support comprising a framework and being at least 50% open in extension between the first and second opposite ends of said support; (e) further characterized by a radial seal on an external portion of the primary filter cartridge, around its first end; and wherein (f) the support has an even taper and decrease in diameter between the first and second ends (80,81) of the support with the largest diameter being adjacent the first end; (g) the second end of the support is a closed end remote from the 30 housing first end; (h) the first end of the support is an open end adjacent the housing first end in axial alignment with the air outlet; (i) the primary filter cartridge is removably positioned over the support with the radial seal removably sealed to the housing: further characterized by (j) a shield on the end cover surrounding the second end of the primary filter cartridge; the shield being arranged such that air, carrying particles, is prevented from immediately impacting the filter media in the filter cartridge before spiralling occurs; (k) the side air flow inlet being a tangential inlet; the air inlet being adjacent the housing second end; the primary filter cartridge comprising a conical extension of media with the largest diameter adjacent the first end of the primary filter cartridge; and, (m) the housing including a dust drop tube therein, said dust drop tube being adjacent the housing first end.