A portable dusty air cleaner (100, 300), comprising: a detachable, removable and exchangeable bin (102, 302) having an open upper end (116, 316) and a closed lower end (118, 318), the open upper end lying generally in a plane, an aperture plate (106, 306) defining a plurality of apertures (120, 320) forming at least a partial ceiling for the bin, a dirty gas distributor (104, 304) positioned to distribute dirty gas laterally inwardly or downwardly into the upper end of the bin from a plurality of peripheral locations with respect to the aperture plate, said dirty gas distributor being supported by the open upper end of the exchangeable bin, a plurality of tubular filters (108, 308) hanging into the bin from the apertures, one per aperture, a dust collection chamber being defined between the aperture plate and the closed lower end of the bin, a roof (110, 310) positioned above the aperture plate, a clean-gas chamber (112, 312) defined between the aperture plate and the roof, said clean-gas chamber being partly defined by a peripheral wall extending between the aperture plate and the roof, and a pulse-jet assembly (114, 314) positioned at least partly in the clean-gas chamber, said pulse-jet assembly including a plurality of nozzles (124, 324) for pulsing jets of gas down the plurality of filters, one nozzle per filter, wherein the bin is generally box-shaped and comprises four vertical sidewalls extending upwardly from a floor, that forms the closed lower end of the bin, the bin being detachable as a modular unit from the dirty gas distributor, and wherein the dirty gas distributor comprises a tubular sidewall forming a tunnel extending along the upper end of the sidewalls, said tubular sidewall having a multiplicity of downwardly or laterally inwardly directed orifices (146, 346) opening into the dust collection chamber defined between the bin and the aperture plate. a detachable, removable and exchangeable bin (102, 302) having an open upper end (116, 316) and a closed lower end (118, 318), the open upper end lying generally in a plane, an aperture plate (106, 306) defining a plurality of apertures (120, 320) forming at least a partial ceiling for the bin, a dirty gas distributor (104, 304) positioned to distribute dirty gas laterally inwardly or downwardly into the upper end of the bin from a plurality of peripheral locations with respect to the aperture plate, said dirty gas distributor being supported by the open upper end of the exchangeable bin, a plurality of tubular filters (108, 308) hanging into the bin from the apertures, one per aperture, a dust collection chamber being defined between the aperture plate and the closed lower end of the bin, a roof (110, 310) positioned above the aperture plate, a clean-gas chamber (112, 312) defined between the aperture plate and the roof, said clean-gas chamber being partly defined by a peripheral wall extending between the aperture plate and the roof, and a pulse-jet assembly (114, 314) positioned at least partly in the clean-gas chamber, said pulse-jet assembly including a plurality of nozzles (124, 324) for pulsing jets of gas down the plurality of filters, one nozzle per filter, wherein the bin is generally box-shaped and comprises four vertical sidewalls extending upwardly from a floor, that forms the closed lower end of the bin, the bin being detachable as a modular unit from the dirty gas distributor, and wherein the dirty gas distributor comprises a tubular sidewall forming a tunnel extending along the upper end of the sidewalls, said tubular sidewall having a multiplicity of downwardly or laterally inwardly directed orifices (146, 346) opening into the dust collection chamber defined between the bin and the aperture plate.