This publication discloses a filter unit connectable to a mobile communication device including a fan for generating an air flow inside the filter unit, electrodes covered with a photo catalytic material like TiO.sub.2 in the air flow, UV-LEDs illuminating the electrodes, and outlet for the air flow directed in direction of user of filter unit.

A protective cover for an external heat exchanger of a heat exchanger such as an air conditioner system or a heat pump system is disclosed. The protective cover includes a continuous loop of screen material and flexible nonporous material. The first end of the screen material and a second end of the screen material are affixed to opposite ends of the flexible nonporous material to form a continuous loop. The continuous loop comprises an upper edge and a lower edge configured to fit over at least a portion of an external heat exchanger having sides, a bottom, and a top, and wherein the continuous loop of screen material covers at least a portion of vent holes on the side of the exchanger. The protective cover includes a top yoke attached to the upper edge of the screen material and the top yoke comprising a cinching mechanism. The top yoke covers at least a portion of the vent holes on the side of the heat exchanger and at least a portion of the top of the external of the exchanger, and the cinching mechanism, when tightened, secures the protective cover to the heat exchanger. A method of installing the disclosed protective cover is also disclosed.

A protective cover for an external heat exchanger of a heat exchanger such as an air conditioner system or a heat pump system is disclosed. The protective cover includes a continuous loop of screen material and flexible nonporous material. The first end of the screen material and a second end of the screen material are affixed to opposite ends of the flexible nonporous material to form a continuous loop. The continuous loop comprises an upper edge and a lower edge configured to fit over at least a portion of an external heat exchanger having sides, a bottom, and a top, and wherein the continuous loop of screen material covers at least a portion of vent holes on the side of the exchanger. The protective cover includes a top yoke attached to the upper edge of the screen material and the top yoke comprising a cinching mechanism. The top yoke covers at least a portion of the vent holes on the side of the heat exchanger and at least a portion of the top of the external of the exchanger, and the cinching mechanism, when tightened, secures the protective cover to the heat exchanger. A method of installing the disclosed protective cover is also disclosed.

A dust filtration unit for a frac sand storage bin and a method for using the same is disclosed. The dust filtration unit includes an adapter base adapted for attachment to an opened inspection hatch on the sand storage bin, a diffuser manifold attached to the adapter base, and a top plate of the diffuser manifold defining a plurality of filter bag orifices. Each of a plurality of filter bags is releasably attached to one of the plurality of filter bag orifices. In a non-limiting embodiment, the dust filtration unit further includes a hinge between the adapter base and the diffuser manifold, wherein the hinge rotatably attaches the adapter base to the diffuser manifold.

A dust filtration unit for a frac sand storage bin and a method for using the same is disclosed. The dust filtration unit includes an adapter base adapted for attachment to an opened inspection hatch on the sand storage bin, a diffuser manifold attached to the adapter base, and a top plate of the diffuser manifold defining a plurality of filter bag orifices. Each of a plurality of filter bags is releasably attached to one of the plurality of filter bag orifices. In a non-limiting embodiment, the dust filtration unit further includes a hinge between the adapter base and the diffuser manifold, wherein the hinge rotatably attaches the adapter base to the diffuser manifold.

A filter bag configured for use in a vacuum cleaner is provided. The filter bag includes a first layer of filter material with a selected value of efficiency in removing airborne particulates, and a second layer that is impregnated with silver or a silver compound with antimicrobial properties.

A filter bag configured for use in a vacuum cleaner is provided. The filter bag includes a first layer of filter material with a selected value of efficiency in removing airborne particulates, and a second layer that is impregnated with silver or a silver compound with antimicrobial properties.

A method for in-situ generation of nanoflower-like manganese dioxide catalyst on filter material is provided. The method comprises: immersing a filter material in a solution containing sodium lauryl sulfate and nitric acid; first modifying the surface of the filter material by using the sodium lauryl sulfate so that a charge layer is wound around the surface of the filter material and tightly absorbs H.sup.+ in an acid solution; and then adding potassium permanganate as an oxidant to react with H.sup.30 on the surface of the filter material to generate nano flower-like manganese dioxide in situ on the surface of the filter material, so as to obtain a composite filter material having a denitration function.

A method for in-situ generation of nanoflower-like manganese dioxide catalyst on filter material is provided. The method comprises: immersing a filter material in a solution containing sodium lauryl sulfate and nitric acid; first modifying the surface of the filter material by using the sodium lauryl sulfate so that a charge layer is wound around the surface of the filter material and tightly absorbs H.sup.+ in an acid solution; and then adding potassium permanganate as an oxidant to react with H.sup.30 on the surface of the filter material to generate nano flower-like manganese dioxide in situ on the surface of the filter material, so as to obtain a composite filter material having a denitration function.

Provided is a centrifuge media separator for separating blast particulate from fine particulate carried by air flowing from a blast cabinet and through the media separator. The centrifuge media separator comprises an upper panel, a lower panel, and an outer wall. The upper panel has a central opening formed therein. The outer wall is configured in a truncated logarithmic shape and which extends between the upper and lower panels. The outer wall has at least one particulate escape aperture formed therein. The upper panel, lower panel and outer wall collectively define a curvilinear air passageway having an inlet and an outlet. An air foil extends from the outer wall in to the air passageway. The distance than the air foil extends in to the air passageway is adjustable. The inlet is configured to allow a flow of air to enter the air passageway and circulate therethrough toward the outlet. The escape aperture is configured to exhaust the blast particulate out of the passageway. The central opening is configured to exhaust the fine particulate out of the passageway.