Method of identifying a valid flow path includes: performing fluid analysis of a porous body, which is ought to have inflow surface and outflow surface, based on structure data representing a 3-dimentional structure of the porous body to generate data indicating at least a pressure distribution of a fluid in a flow path in the porous body; and identifying a valid flow path that allows the fluid to flow from the inflow surface to the outflow surface based on a gradient of pressure values along a flow direction of the fluid in the flow path.

The present invention concerns an air filter cleaning device comprising a rotating stage on which an air filter to be cleaned is seated and rotated about its central axis; and an inner outlet head configured to extend through a central opening of the rotating stage and be vertically moveable between a lower position and an upper position at least parallel to the central axis of the air filter, said outlet head having at least one gas outlet for discharging pressurised air outwardly through at least one wall of the air filter for dislodging contaminants; an outer vacuum head located externally to the air filter for suctioning the contaminants dislodged from the air filter by the inner outlet head wherein the inner outlet head is further configured such that the lower position is located less than abourt 1,500 mm above a support surface for the cleaning device.

An aerosol distributor for filter leakage detection in a gas filtration system, said aerosol distributor being configured to be positioned in a gas stream upstream of the filter, said aerosol distributor comprising: a rotatable distributor housing comprising a hub in fluid connection with two or more radial chambers evenly distributed around said hub, the distributor housing having an inlet for admitting a test aerosol from an aerosol source via the hub into the radial chambers, each radial chamber being elongated, sealed at a distal end, and provided with a plurality of outlet holes distributed along the length thereof for releasing the aerosol from the radial chamber into a gas stream surrounding the aerosol distributor, and wherein said aerosol distributor further comprises an actuator configured to rotate the distributor housing around a central axis thereof.

A method and apparatus for filter testing for use within an air handling system. The air handling system may include one or more scan assemblies. The scan assembly may include a track system using one or more magnetic arrays.

An aerosol distributor and an arrangement for filter leakage detection in a gas filtration system comprising such aerosol distributor, the aerosol distributor being configured to be positioned in a gas stream upstream of a filter, said aerosol distributor comprising: a hollow housing having at least one aerosol inlet for admitting an aerosol from an aerosol source into a chamber inside said housing, and a plurality of aerosol outlet holes for releasing the aerosol from the chamber into a gas stream surrounding the housing, wherein said housing has a plate like shape having an upstream surface configured to face an incoming gas stream and a downstream surface configured to face a filter, wherein said housing comprises a plurality of channels extending between channel inlets at the upstream surface and channel outlets at the downstream surface of the housing, such that gas from the gas stream can pass through the housing.

Systems are provided for a diesel oxidation catalyst. In one example, the diesel oxidation catalyst comprises a washcoat with different catalytically active portions for reacting with one or more of carbon containing compounds and NO.sub.x. The diesel oxidation catalyst is located upstream of a particulate filter in an exhaust passage.

A dirt collector that includes a housing and an air-permeable filter media extending from the housing such that the filter media and housing at least partially define a collection volume. The housing has an inlet opening in fluid communication with the volume and at least a portion of the housing is transmissive of infrared radiation

A vacuum cleaner that includes a suction source configured to generate a suction airflow, a dirt collector in fluid communication with the suction source and configured to separate debris from the suction airflow and the dirt collector is configured to store the debris separated from the suction airflow. The vacuum further includes an infrared sensor operable to output a signal corresponding to a distance to an amount of debris stored in the dirt collector, a controller that receives the signal, and the controller is operable to determine a fill level stored in the dirt collector based on the signal. A visual display displays the fill level stored in the dirt collector.

A honeycomb body having a porous ceramic honeycomb structure with a first end, a second end, and a plurality of walls having wall surfaces defining a plurality of inner channels. A highly porous layer is disposed on one or more of the wall surfaces of the honeycomb body. The highly porous layer has a porosity greater than 90%, and has an average thickness of greater than or equal to 0.5 μm and less than or equal to 10 μm. A method of making a honeycomb body includes depositing a layer precursor on a ceramic honeycomb body and binding the layer precursor to the ceramic honeycomb body to form the highly porous layer.

An apparatus and a system is provided that may be utilized to determine air flow through an air filter and/or a plurality of air filters. The present invention utilizes a demonstration apparatus to illustrate the differences in air flow and air restriction between a plurality of different air filters and filtration media. The apparatus and system utilizes a common plenum which subjects the plurality of air filters to the same differential pressure. The air flows through a first side of the air filter and is measured on the second side of the air filter by utilizing a wind meter or similar device to gauge the amount of air flow velocity of the second side of the filter. Additionally, the apparatus and system utilizes a display means to illustrate the differing air velocity through the second side of the air filter.