A vacuum cleaner including a dirty air inlet, a fluid flow path extending from the dirty air inlet to a clean air outlet, a fluid flow motor positioned in the fluid flow path, and a filter assembly positioned in the fluid flow path. The filter assembly including a first cylindrical filter and a second cylindrical filter nested within and removable from the first cylindrical filter. An inner diameter of the first cylindrical filter is smaller than an outer diameter of the second cylindrical filter such that the second cylindrical filter is compressed in order to be nested within the first cylindrical filter.

A vacuum cleaner including a dirty air inlet, a fluid flow path extending from the dirty air inlet to a clean air outlet, a fluid flow motor positioned in the fluid flow path, and a filter assembly positioned in the fluid flow path. The filter assembly including a first cylindrical filter and a second cylindrical filter nested within and removable from the first cylindrical filter. An inner diameter of the first cylindrical filter is smaller than an outer diameter of the second cylindrical filter such that the second cylindrical filter is compressed in order to be nested within the first cylindrical filter.

A water separation mechanism includes a housing having a hollow interior, an inlet and an outlet, and a center body arranged within the hollow interior. A plurality of coalescing features are mounted about a periphery of the center body in a plurality of stages. The plurality of stages are arranged in series relative to a direction of an airflow through the housing. The plurality of coalescing features are configured to separate the airflow into a wet first airstream and a dry second airstream.

A water separation mechanism includes a housing having a hollow interior, an inlet and an outlet, and a center body arranged within the hollow interior. A plurality of coalescing features are mounted about a periphery of the center body in a plurality of stages. The plurality of stages are arranged in series relative to a direction of an airflow through the housing. The plurality of coalescing features are configured to separate the airflow into a wet first airstream and a dry second airstream.

A particle separation device to remove particulate matter from an exterior air flow for use with an environmental control system includes a curved airflow path with an inner radius and an outer radius, the curved air flow path to receive the exterior air flow, a particle passage disposed along at least one of the inner radius and the outer radius to receive the particulate matter from the exterior air flow, a circumferential volute to receive the particulate matter from the particle passage, and a duct to transport the particulate matter from the circumferential volute to a downstream region.

An air pre-cleaner spin tube includes a vaned inlet section including an inlet flange, and an outer tube inlet portion including an outer wall forming a nozzle that defines a radial direction, and a longitudinal axis. Also, a central stem is disposed in the nozzle, and a plurality of vanes extends from the central stem to the outer wall.

An air filter system for use as original equipment or conventional filter replacement in a building ventilation system includes multiple helical particle separator elements in a parallel array, each element configured to remove particles from a respective portion of contaminated inflowing air. The outflows from the separator elements are combined into a common clean air outflow which is delivered to the building ventilation system. A common waste receptable collects particles removed by the separator elements and is cooperatively connected to a scavenger air system that draws air through the array and the receptable and relocates them to a desired location. The separator element array may be housed in a filter system containing the main system fan arrangement that is configured to draw or force the airflow through the multiple particle separators.

An air filter system for use as original equipment or conventional filter replacement in a building ventilation system includes multiple helical particle separator elements in a parallel array, each element configured to remove particles from a respective portion of contaminated inflowing air. The outflows from the separator elements are combined into a common clean air outflow which is delivered to the building ventilation system. A common waste receptable collects particles removed by the separator elements and is cooperatively connected to a scavenger air system that draws air through the array and the receptable and relocates them to a desired location. The separator element array may be housed in a filter system containing the main system fan arrangement that is configured to draw or force the airflow through the multiple particle separators.

A diffuser for a jet pump of a separator comprises an inlet defining a first flow area; an outlet in fluid communication with the inlet through which fluid exits the diffuser, in which a flow path extends from the inlet to the outlet, and in which the outlet defines a second flow area greater than the first flow area so that a velocity of fluid flowing through the inlet is greater than a velocity of fluid flowing through the outlet; and a communication port extending through a wall of the diffuser with an inlet in communication with an interior of the diffuser and an outlet in communication with an exterior of the diffuser, in which the communication port inlet is between the diffuser inlet and the diffuser outlet, so that contaminants separated from the fluid stream are removed through the communication port.

A diffuser for a jet pump of a separator comprises an inlet defining a first flow area; an outlet in fluid communication with the inlet through which fluid exits the diffuser, in which a flow path extends from the inlet to the outlet, and in which the outlet defines a second flow area greater than the first flow area so that a velocity of fluid flowing through the inlet is greater than a velocity of fluid flowing through the outlet; and a communication port extending through a wall of the diffuser with an inlet in communication with an interior of the diffuser and an outlet in communication with an exterior of the diffuser, in which the communication port inlet is between the diffuser inlet and the diffuser outlet, so that contaminants separated from the fluid stream are removed through the communication port.