A dust collector comprising: an aperture formed through a tubesheet structure (34, 35; 134; 234) located in a housing (12; 112; 212); a filter cartridge (30; 130; 230) located in the housing (12; 112; 212), wherein the filter cartridge (30; 130; 230) is positioned such that air passing through the aperture in the tubesheet structure (34, 35; 134; 234) must pass through the filter cartridge (30; 130; 230), wherein the tubesheet structure (34, 35; 134; 234) and the filter cartridge (30; 130; 230) separate the housing (12; 112; 212) into a clean air plenum and a dirty air plenum; wherein the dirty air plenum comprises a dirty air channel (24, 25, 26; 124, 125; 224) located above a dirty air chamber (40; 140; 240), wherein the dirty air channel (24, 25, 26; 124, 125; 224) is located between a dirty air inlet through which dirty air enters the dirty air plenum and the dirty air chamber (40; 140; 240), wherein the dirty air chamber (40; 140; 240) is located below a top of the filter cartridge (30; 130; 230), and wherein the dirty air channel (24, 25, 26; 124, 125; 224) defines a dirty air flow axis through the dirty air channel; wherein the clean air plenum comprises an upper clean air chamber (53, 54; 153; 253) located above the top of the filter cartridge (30; 130; 230) and a lower clean air chamber (51, 52; 251) located below the upper clean air chamber (53, 54; 153; 253) and the top of the filter cartridge (30; 130; 230), wherein the filter cartridge (30; 130; 230) comprises a dirty air face (31; 231) facing away from the lower clean air chamber (51, 52; 251), and wherein dirty air moving through the dirty air channel (24, 25, 26; 124, 125; 224) from the dirty air inlet to the dirty air chamber (40; 140; 240) along the dirty air flow axis flows past the upper clean air chamber (53, 54; 153; 253); and wherein dirty air passing downward through the dirty air channel (24, 25, 26; 124, 125; 224) along the dirty air flow axis moves past a top of the filter cartridge (30; 130; 230) before reaching the dirty air chamber; wherein the dirty air channel (24, 25, 26; 124, 125; 224) is configured such that dirty air entering the dirty air chamber (40; 140; 240) from the dirty air channel (24, 25, 26; 124, 125; 224) along the dirty air flow axis cannot directly impinge on the dirty air face (31; 231) of the filter cartridge (30; 130; 230) without changing direction in the dirty air chamber; and a portion of the dirty air face (31; 231) of the filter cartridge (30; 130; 230) faces the dirty air flow axis, characterized in that the dirty air flow axis forms an included angle greater than zero degrees with the portion of the dirty air face (31; 231) of the filter cartridge (30; 130; 230), and wherein the included angle opens in the downward direction towards the dirty air chamber (40; 140; 240). an aperture formed through a tubesheet structure (34, 35; 134; 234) located in a housing (12; 112; 212); a filter cartridge (30; 130; 230) located in the housing (12; 112; 212), wherein the filter cartridge (30; 130; 230) is positioned such that air passing through the aperture in the tubesheet structure (34, 35; 134; 234) must pass through the filter cartridge (30; 130; 230), wherein the tubesheet structure (34, 35; 134; 234) and the filter cartridge (30; 130; 230) separate the housing (12; 112; 212) into a clean air plenum and a dirty air plenum; wherein the dirty air plenum comprises a dirty air channel (24, 25, 26; 124, 125; 224) located above a dirty air chamber (40; 140; 240), wherein the dirty air channel (24, 25, 26; 124, 125; 224) is located between a dirty air inlet through which dirty air enters the dirty air plenum and the dirty air chamber (40; 140; 240), wherein the dirty air chamber (40; 140; 240) is located below a top of the filter cartridge (30; 130; 230), and wherein the dirty air channel (24, 25, 26; 124, 125; 224) defines a dirty air flow axis through the dirty air channel; wherein the clean air plenum comprises an upper clean air chamber (53, 54; 153; 253) located above the top of the filter cartridge (30; 130; 230) and a lower clean air chamber (51, 52; 251) located below the upper clean air chamber (53, 54; 153; 253) and the top of the filter cartridge (30; 130; 230), wherein the filter cartridge (30; 130; 230) comprises a dirty air face (31; 231) facing away from the lower clean air chamber (51, 52; 251), and wherein dirty air moving through the dirty air channel (24, 25, 26; 124, 125; 224) from the dirty air inlet to the dirty air chamber (40; 140; 240) along the dirty air flow axis flows past the upper clean air chamber (53, 54; 153; 253); and wherein dirty air passing downward through the dirty air channel (24, 25, 26; 124, 125; 224) along the dirty air flow axis moves past a top of the filter cartridge (30; 130; 230) before reaching the dirty air chamber; wherein the dirty air channel (24, 25, 26; 124, 125; 224) is configured such that dirty air entering the dirty air chamber (40; 140; 240) from the dirty air channel (24, 25, 26; 124, 125; 224) along the dirty air flow axis cannot directly impinge on the dirty air face (31; 231) of the filter cartridge (30; 130; 230) without changing direction in the dirty air chamber; and a portion of the dirty air face (31; 231) of the filter cartridge (30; 130; 230) faces the dirty air flow axis, characterized in that the dirty air flow axis forms an included angle greater than zero degrees with the portion of the dirty air face (31; 231) of the filter cartridge (30; 130; 230), and wherein the included angle opens in the downward direction towards the dirty air chamber (40; 140; 240).