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.

Compound air filters and methods thereof are provided for sequestering airborne contaminants including volatile organic compounds (VOCs) from air streamed through the air filters. An air filter can include a support frame having a shape and size suitable for seating the air filter within an air-filtering system. A compound filter medium can be retained within the support frame to remove the airborne contaminants and VOCs from air flowing through the air filter and the air-filtering system containing one or more of the air filters. A first media layer of the compound filter medium can be pleated with pleats and configured to exhibit a relatively high filtration efficiency and a low air pressure drop across the filter medium. A second media layer of the filter medium can be coupled to the first media layer and configured to maintain a uniform distribution of the pleats with the first media layer.

Compound air filters and methods thereof are provided for sequestering airborne contaminants including volatile organic compounds (VOCs) from air streamed through the air filters. An air filter can include a support frame having a shape and size suitable for seating the air filter within an air-filtering system. A compound filter medium can be retained within the support frame to remove the airborne contaminants and VOCs from air flowing through the air filter and the air-filtering system containing one or more of the air filters. A first media layer of the compound filter medium can be pleated with pleats and configured to exhibit a relatively high filtration efficiency and a low air pressure drop across the filter medium. A second media layer of the filter medium can be coupled to the first media layer and configured to maintain a uniform distribution of the pleats with the first media layer.

Embodiments of the present disclosure may suppress conduction between an anode and a cathode caused by condensed water in an oil removal apparatus in which oil particles are collected in a filter disposed between the anode and the cathode. An insulating layer may be sandwiched either between the filter and at least one of the anode and the cathode of the bipolar electrode, or within the filter so as to extend in a flow direction of blow-by gas, and may have an insulating property so as to prevent condensed water generated when moisture in the blow-by gas condenses, from connecting the anode and the cathode of the bipolar electrode.

Embodiments of the present disclosure may suppress conduction between an anode and a cathode caused by condensed water in an oil removal apparatus in which oil particles are collected in a filter disposed between the anode and the cathode. An insulating layer may be sandwiched either between the filter and at least one of the anode and the cathode of the bipolar electrode, or within the filter so as to extend in a flow direction of blow-by gas, and may have an insulating property so as to prevent condensed water generated when moisture in the blow-by gas condenses, from connecting the anode and the cathode of the bipolar electrode.

An air cleaner assembly is disclosed. In one aspect, the air cleaner assembly includes a housing defining an inlet and an outlet, and including an access opening between the inlet and outlet. The air cleaner also includes a filter cartridge received within the housing and covering the access opening. The air cleaner also includes a lock mechanism. The lock mechanism is movable between an unlocked position in which the filter cartridge can be installed and removed from the housing and a locked position in which the filter cartridge is secured within the housing. The filter cartridge and lock mechanism include interacting features allowing the lock mechanism to be moved from the unlocked position to the locked position only when the filter cartridge is installed within the housing.

An air cleaner assembly is disclosed. In one aspect, the air cleaner assembly includes a housing defining an inlet and an outlet, and including an access opening between the inlet and outlet. The air cleaner also includes a filter cartridge received within the housing and covering the access opening. The air cleaner also includes a lock mechanism. The lock mechanism is movable between an unlocked position in which the filter cartridge can be installed and removed from the housing and a locked position in which the filter cartridge is secured within the housing. The filter cartridge and lock mechanism include interacting features allowing the lock mechanism to be moved from the unlocked position to the locked position only when the filter cartridge is installed within the housing.

Present embodiments relate to an air filter adapter for use with open style engine air filters. More particularly, but without limitation, present embodiments relate to a filter adapter having a hydrocarbon trap positioned within the adapter.

An air filter system for a motor vehicle includes a common housing, first and second D-shaped filter elements and a common cover. The common housing defines a first airflow chamber extending between a first inlet duct and a first outlet duct and a second airflow chamber extending between a second inlet duct and a second outlet duct. The first airflow chamber is fluidly separated from the second airflow chamber. The first D-shaped filter element is disposed in the first airflow chamber for filtering air passing through the first airflow chamber. The second D-shaped filter element is disposed in the second airflow chamber for filtering air passing through the second airflow chamber. The common cover is secured to the housing and closes the first airflow chamber and the second airflow chamber.

A filter element having a longitudinal center axis for a fresh air system of an internal combustion engine may include a first plate filter body composed of a pleated filter material and a separate second plate filter body composed of a pleated filter material. The filter element may include first wall body and a second wall body, and a first end body and a second end body. The first wall body, the second wall body, the first end body and the second end body may be connected to the first plate body and the second plate filter body to define an inner space. At least one of the first plate filter body and the second plate filter body may include a curvature projecting to the interior space in a profile extending transversely to a longitudinal direction with respect to the longitudinal center axis.