An air cleaner system comprising: an air cleaner housing comprising an air flow inlet and an air flow outlet, wherein the air cleaner housing comprises an outer housing sidewall and a filter cartridge recess located within the outer housing sidewall between the air flow inlet and the air flow outlet; a filter cartridge located within the filter cartridge recess, wherein the filter cartridge extends along a longitudinal axis between a first filter end and a second filter end and comprises filter media configured to filter air passing through the filter media, and wherein air entering the air cleaner housing through the air flow inlet passes through the filter media before passing out of the air cleaner housing through the air flow outlet, the filter cartridge defining a cartridge length between the first filter end and the second filter end measured along the longitudinal axis; and a pulse tube extension coupled to the filter cartridge and extending into the filter cartridge such that an outer tube surface of the pulse tube extension faces the filter cartridge, wherein the pulse tube extension extends into a cartridge passage towards the second filter end of the filter cartridge, and wherein the pulse tube extension extends within the filter cartridge for less than or equal to 90% of the cartridge length, characterized by the fact that the filter cartridge and the pulse tube extension are configured to be inserted into and removed from the filter cartridge recess of the air cleaner housing in a direction at least partially transverse to the longitudinal axis, wherein the outer housing sidewall defines a housing opening configured to allow passage of the filter cartridge and pulse tube extension therethrough, and wherein the air cleaner housing further comprises a housing access panel movably coupled to the outer housing sidewall and configured to move between an open configuration and a closed configuration, wherein the housing opening is sealed when the housing access panel is in the closed configuration, and wherein a first tube end of the pulse tube extension is coupled to the first filter end of the filter cartridge and the pulse tube extension positioned such that the first tube end is flush with the first filter end. an air cleaner housing comprising an air flow inlet and an air flow outlet, wherein the air cleaner housing comprises an outer housing sidewall and a filter cartridge recess located within the outer housing sidewall between the air flow inlet and the air flow outlet; a filter cartridge located within the filter cartridge recess, wherein the filter cartridge extends along a longitudinal axis between a first filter end and a second filter end and comprises filter media configured to filter air passing through the filter media, and wherein air entering the air cleaner housing through the air flow inlet passes through the filter media before passing out of the air cleaner housing through the air flow outlet, the filter cartridge defining a cartridge length between the first filter end and the second filter end measured along the longitudinal axis; and filter cartridge extends along a longitudinal axis between a first filter end and a second filter end and comprises filter media configured to filter air passing through the filter media, and wherein air entering the air cleaner housing through the air flow inlet passes through the filter media before passing out of the air cleaner housing through the air flow outlet, the filter cartridge defining a cartridge length between the first filter end and the second filter end measured along the longitudinal axis; and a pulse tube extension coupled to the filter cartridge and extending into the filter cartridge such that an outer tube surface of the pulse tube extension faces the filter cartridge, wherein the pulse tube extension extends into a cartridge passage towards the second filter end of the filter cartridge, and wherein the pulse tube extension extends within the filter cartridge for less than or equal to 90% of the cartridge length, the filter cartridge such that an outer tube surface of the pulse tube extension faces the filter cartridge, wherein the pulse tube extension extends into a cartridge passage towards the second filter end of the filter cartridge, and wherein the pulse tube extension extends within the filter cartridge for less than or equal to 90% of the cartridge length, characterized by the fact that the filter cartridge and the pulse tube extension are configured to be inserted into and removed from the filter cartridge recess of the air cleaner housing in a direction at least partially transverse to the longitudinal axis, wherein the outer housing sidewall defines a housing opening configured to allow passage of the filter cartridge and pulse tube extension therethrough, and wherein the air cleaner housing further comprises a housing access panel movably coupled to the outer housing sidewall and configured to move between an open configuration and a closed configuration, wherein the housing opening is sealed when the housing access panel is in the closed configuration, and wherein a first tube end of the pulse tube extension is coupled to the first filter end of the filter cartridge and the pulse tube extension positioned such that the first tube end is flush with the first filter end.