A powered air filtering device comprising: a first curved filter cartridge having a cartridge inlet and a cartridge outlet ; and comprising: a curved filter bed having a concave surface disposed such that air to be filtered passes through the inlet, the curved filter bed, and the outlet, said curved filter bed having a convex shape when viewed from the inlet side of the filter cartridge and a concave shape when viewed from the outlet side of the filter cartridge; a housing, the housing being configured to contain the first filter cartridge within the housing, the housing comprising: a housing base including a blower assembly and having a blower inlet in fluid communication with the cartridge outlet and a blower outlet , said blower output being a single opening, the blower assembly comprising a motor proximate to the concave surface of the curved filter bed and wherein the motor has a rotational axis such that the rotational axis is adjacent to the center of curvature of the curved filter bed; a housing cover configured to contain the first filter cartridge in the housing, the housing cover comprising an opening to admit fluid into the filter cartridge and being in fluid communication with the filter cartridge, and a mechanism in the housing cover for attachment of the housing cover to the housing base; a hose attached to the blower outlet; and a breathing head gear attached to the hose. a first curved filter cartridge having a cartridge inlet and a cartridge outlet ; and comprising: a curved filter bed having a concave surface disposed such that air to be filtered passes through the inlet, the curved filter bed, and the outlet, said curved filter bed having a convex shape when viewed from the inlet side of the filter cartridge and a concave shape when viewed from the outlet side of the filter cartridge; a housing, the housing being configured to contain the first filter cartridge within the housing, the housing comprising: a housing base including a blower assembly and having a blower inlet in fluid communication with the cartridge outlet and a blower outlet , said blower output being a single opening, the blower assembly comprising a motor proximate to the concave surface of the curved filter bed and wherein the motor has a rotational axis such that the rotational axis is adjacent to the center of curvature of the curved filter bed; a housing cover configured to contain the first filter cartridge in the housing, the housing cover comprising an opening to admit fluid into the filter cartridge and being in fluid communication with the filter cartridge, and a mechanism in the housing cover for attachment of the housing cover to the housing base; a housing base including a blower assembly and having a blower inlet in fluid communication with the cartridge outlet and a blower outlet , said blower output being a single opening, the blower assembly comprising a motor proximate to the concave surface of the curved filter bed and wherein the motor has a rotational axis such that the rotational axis is adjacent to the center of curvature of the curved filter bed; a housing cover configured to contain the first filter cartridge in the housing, the housing cover comprising an opening to admit fluid into the filter cartridge and being in fluid communication with the filter cartridge, and a mechanism in the housing cover for attachment of the housing cover to the housing base; a hose attached to the blower outlet; and a breathing head gear attached to the hose. <EOS>