A combined bypass filter element module is disclosed. The combined bypass filter element module includes at least one filter slot for receiving at least one filter element that can be arranged in the at least one filter slot. A bypass flap device is arranged in a flow direction in parallel with the at least one filter slot.

A filter media holder for securing a filter media within a filter housing comprises a first grill plate having a plurality of first apertures defined therethrough, and a second grill plate having a plurality of second apertures defined therethrough. In a first configuration, the second grill plate is spaced apart from the first grill plate to allow a filter media to be disposed on the first grill plate or the second grill plate, and in a second configuration, the second grill plate is disposed proximate to the first grill plate such that the filter media is secured between the first grill plate and the second grill plate.

A filter device of a motor vehicle may include a step filter, two flow paths, and a plurality of adjustable air flaps. The step filter may include a plurality of individual filter elements arranged fluidically in series. A first flow path may extend through at least two individual filter elements. A second flow path may extend through a number of the plurality of individual filter elements which, compared to a number of the plurality of individual filter elements through which the first flow path extends, may be reduced by at least one single individual filter element. The plurality of adjustable air flaps may be arranged at least one of upstream and downstream of the step filter. At least one air stream may be guidable through the step filter along at least one of the first flow path and the second flow path via the plurality of adjustable air flaps.

An aircraft engine cooling air system is configured to provide cooling air to turbine components. The system has an airflow path extending from a source of cooling air to the turbine components. A baffle is disposed in the airflow path upstream of the turbine components. The baffle has a filtering surface defining a plurality of filtering holes sized to trap particulate matter suspended in the cooling air. A bypass passage is fluidly connected to the source of cooling air and the turbine components in parallel with the baffle so as to allow airflow to the turbine components when the filtering holes of the baffle are clogged.

A ventilation type air cleaner includes a housing having a central rotating shaft including a purification part, a washing part, and a sterilization part in a circumferential direction with respect to the central rotating shaft, a rotating unit installed to be rotatable about the central rotating shaft as a rotation center in the housing, a filter assembly detachably coupled to the rotating unit and configured to sequentially pass through the purification part, the washing part, and the sterilization part according to rotation of the rotating unit, an intake duct connected to the housing and configured to guide a flow of air introduced to the purification part, and an exhaust duct connected to the housing and configured to guide a flow of air discharged from the purification part.

A device for filtering and settling entrained particles from a gas feed stream, the device comprising a cylindrical v-wire filter element to filter the entrained particles, a cap located above the v-wire filter element comprising an outer surface, an under surface, and a downward rim attached to a perimeter of the under surface, and an open annulus area located between and in fluid communication with an open top portion of the v-wire filter element and the under surface of the cap.

A filter element for filtering a fluid has a frame and at least one filter bellows arranged in the frame and provided with a first areal inflow surface for a first fluid flow and at least one second inflow surface for a second fluid flow separate from the first fluid flow. The second inflow surface is separate from the first areal inflow surface. A flow channel is provided to guide the second fluid flow and has a raw-side flow channel section arranged within the frame. A filter system provided with a filter housing is provided with such a filter element arranged exchangeably in the filter housing between a raw side and a clean side. The filter housing has a first inlet for the first fluid flow communicating with the first inflow surface and at least a second inlet for the second fluid flow communicating with the second inflow surface.

A filter element for filtering a fluid is provided with at least one filter bellows with a first areal inflow surface for a first fluid flow of the fluid and at least one second inflow surface for a second fluid flow of the fluid separate from the first fluid flow of the fluid. The at least one second inflow surface is separate from the first areal inflow surface. A flow channel section for the second fluid flow of the fluid is provided. At least one compensation element is arranged in the flow channel section for the second fluid flow of the fluid at a raw side of the filter element. A filter system with a filter housing is provided with such a filter element arranged exchangeably in the filter housing.

A filter for compressed air systems is provided. The filter includes a filter housing with a filter therein between an air inlet and an air outlet. Compressed air flowing between the air inlet and the air outlet passes through the filter housing and the filter element. A base is removably fastened to the filter housing which may be separated from the filter housing to allow the filter element to be removed and replaced.

Methods for controlling air filtration in an enclosure include measuring contaminants in an internal and an external environment using respective internal and external contaminant sensors. An increase in a corrosion rate is determined for objects in the enclosure if unfiltered external air intake is increased for cooling based on the measured contaminants in the internal and external environments. An air pressure needed to filter external air using a filter in the filtered air intake is determined. An intake of unfiltered external air is controlled by bypassing the filter in the filtered air intake, based on the corrosion rate increase and the determined air pressure. A predicted filter lifetime is updated based on the intake of unfiltered external air. A warning is provided if the contaminant sensor information associated with the filter exceeds an instantaneous failure threshold or if the determined remaining filter lifetime falls below a filter lifetime threshold.