A system includes a filter assembly having a filter material disposed in an air flow, a first pressure transducer disposed upstream of the filter material with respect to the air flow, a second pressure transducer disposed downstream of the filter material with respect to the air flow, and a controller coupled to the first pressure transducer and the second pressure transducer, where the controller receives feedback from the first pressure transducer and the second pressure transducer indicative of a pressure differential of the air flow across the filter material, and where the controller is configured to index the filter when the pressure differential of the air flow across the filter material exceeds a threshold.

A system includes a filter assembly having a filter material disposed in an air flow, a first pressure transducer disposed upstream of the filter material with respect to the air flow, a second pressure transducer disposed downstream of the filter material with respect to the air flow, and a controller coupled to the first pressure transducer and the second pressure transducer, where the controller receives feedback from the first pressure transducer and the second pressure transducer indicative of a pressure differential of the air flow across the filter material, and where the controller is configured to index the filter when the pressure differential of the air flow across the filter material exceeds a threshold.

An apparatus for separating particles from an airflow, the apparatus comprising a housing comprising an inner wall, and a body positioned within the housing and separated therefrom so as to define a substantially annular flow path between the body and the inner wall. The housing is rotationally stationary, and the body is rotatable relative to the housing about a rotational axis, the body comprising an impeller section having a first set of blades extending from the body into the annular flow path towards the inner wall of the housing, the impeller being rotatable for generating airflow through the apparatus and for generating swirl within the airflow, and a turbine section located downstream of the impeller section, the turbine section having a second set of blades for recapturing rotational energy from the airflow.

Disclosed are multiple stage rotating coalescer devices comprising a first stage and a second stage. The first stage may include a rotating coalescing element comprising coalescing media. The second stage is positioned either upstream or downstream or the first stage. The second stage may include one of: (i) a rotating cone stack separator, or (ii) a separate rotating coalescing element comprising coalescing media.

An air filter system in accordance with the present invention includes a filter housing that defines an airflow channel. A supply roll of a filter medium, and a take-up roll for receiving the filter medium from the supply roll are positioned parallel to each other in the airflow channel. A plurality of wire mesh diverter-screens are positioned between the supply roll and the take-up roll to establish a tortuous path for statically positioning the filter medium across the airflow channel. Periodically, the take-up roll can be rotated to draw replacement filter medium into position on the tortuous path.

An oil separator configured to separate from gas mist oil contained in target gas of the present invention is aimed to enhance separation efficiency of oil mist contained in target gas while reducing the weight of the separation disks. The oil separator of the present invention includes a rotor. This rotor has a plurality of separation disks 34 (61, 62) layered along the axis line of the spindle. Each of the separation disks 34 are configured with truncated cone shape plate members and have formed concavo-convex ribs 64, 65 extending from the rotational center in the radiation direction on the outer peripheral side parts 61b, 62b corresponding to the inclined surfaces of the truncated cone. The concavo-convex ribs 64, 65 include first convex portions 66 and second convex portions 67 where the first convex portions 66 include on the outer peripheral side parts 61b, 62b a convex on the front surface side and a concave on the back surface side, and the second convex portions 67 include on the outer peripheral side parts 61b, 62b a convex on the back surface side and a concave on the front surface side.

A lower partition wall having a through hole vertically penetrates the lower partition wall center. A spindle is inserted into the through hole. The top surface side of the lower partition wall includes a convex portion, a groove, and a drain hole. The convex portion is concentrically disposed at the through hole periphery. The groove extends, from an outer peripheral side of the convex portion, toward the through hole on an inner peripheral side. The drain hole is outside the convex portion, vertically penetrating the lower partition wall. The separated oil circles a top surface of the lower partition wall. The oil flowing to an inner peripheral side of the lower partition wall is guided to the groove and flows into the through hole. The oil flowing to an outer peripheral side of the lower partition wall flows into the drain hole.

An air filter assembly and method of using the assembly are described. The assembly can include a filter media cartridge and a filter frame connected to the filter media cartridge. The filter media cartridge can have a cartridge body defining an internal volume, an aperture in a wall of the body, a supply roller for supplying filter media, and a take-up roller for receiving the filter media. The filter frame is configured for an air handler filter slot of an HVAC system. The filter media can extend about the longitudinal axis of the filter frame from and back to the filter media cartridge such that a double layer of the filter media covers an air flow opening defined by the filter frame. The filter frame can have a pair of side frame sections, each having an expansion joint that allows the side frame section to be lengthened or shortened.

An indoor unit for an air-conditioning apparatus includes a cartridge provided to an air inlet so as to be freely mountable and dismountable. The cartridge accommodates a filter so as to be freely movable in a fore-and-aft direction and has an opening port formed in one end portion in the fore-and-aft direction. A dust box is provided on a side of the end portion of the cartridge. The dust box includes a cleaning mechanism configured to clean the filter and a dust collecting portion configured to collect dust.

In an assembly for controlling filtering of vacuum air flow evacuated from a system storage container through an air evacuation duct in vacuum operated waste collection systems, an assembly housing is installed stationary in the air evacuation duct with an inner passage in the assembly housing communicating with the air evacuation duct, a control unit is installed in the assembly housing with a shiftable member intersecting the inner passage in the housing, whereby the shiftable member has one or more air filtering elements and the air filtering element being movable in a direction generally transversal to the inner passage in the assembly housing.