A secondary element for a filter system has first and second ends oppositely positioned to each other in longitudinal direction. The first end is closed by a closed end disk. The closed end disk has a first connection device for interacting with a complementary second connection device of a central tube of the filter system and for fixing the secondary element on the central tube. The first connection device has lock elements with radially inwardly oriented lock hooks distributed circumferentially on the closed end disk. A filter medium surrounds the lock elements. The lock elements include two directly neighboring lock elements having a distance relative to each other along the circumference of the closed end disk that is larger than a circumferential measurement of a radially outwardly oriented deflection element arranged at a collar of the central tube. A filter system with such a secondary element is provided.

An air filter including two opposing open ends, and a filter area circumferentially enclosing a cavity in between. The first open end frictionally and sealingly engages the filter housing including an air port, while the second end engages the housing to close the second end from passage of air. The filter area may be reinforced to provide a durable, reusable filter. The filter material may be selected to provide depth loading and increase the particulate capacity of the filter.

An air filter including two opposing open ends, and a filter area circumferentially enclosing a cavity in between. The first open end frictionally and sealingly engages the filter housing including an air port, while the second end engages the housing to close the second end from passage of air. The filter area may be reinforced to provide a durable, reusable filter. The filter material may be selected to provide depth loading and increase the particulate capacity of the filter.

A rotatingly driven filter element for filtering incoming air is to be arranged in a machine part upstream of an intake chamber of a cooling system or of a combustion air distribution device of an internal combustion engine of a self-propelled working machine. The filter element has a rim area with a circumferentially extending section provided with air guiding elements oriented toward and projecting into the intake chamber. The rim area, when the filter element is arranged in the machine part, is positioned at a minimal spacing relative to the machine part and an air gap is formed between the rim area and the machine part. The air guiding elements guide purified inflow air out of the intake chamber into a region of the air gap to effect a sealing action of the air gap.

An air filter including two opposing open ends, and a filter area circumferentially enclosing a cavity in between. The first open end frictionally and sealingly engages the filter housing including an air port, while the second end engages the housing to close the second end from passage of air. The filter area may be reinforced to provide a durable, reusable filter. The filter material may be selected to provide depth loading and increase the particulate capacity of the filter.

An air filter including two opposing open ends, and a filter area circumferentially enclosing a cavity in between. The first open end frictionally and sealingly engages the filter housing including an air port, while the second end engages the housing to close the second end from passage of air. The filter area may be reinforced to provide a durable, reusable filter. The filter material may be selected to provide depth loading and increase the particulate capacity of the filter.

Method for arranging on a component of a recipient (100) a gas filter comprising a filter layer of filter material (120) and a cover layer of covering material (130), wherein the filter layer (120) is located between the component of the recipient (100) and the cover layer (130), the method further comprising: welding the filter layer (120) and the cover layer (130) to the component of the recipient (100) by arranging welds (140) such that between two welds (140), welds tunnels (150) filled with filter material (120) are formed, which are intended to enable gas exchange between the interior of the recipient (100) and an area externally of the recipient (100).

Method for arranging on a component of a recipient (100) a gas filter comprising a filter layer of filter material (120) and a cover layer of covering material (130), wherein the filter layer (120) is located between the component of the recipient (100) and the cover layer (130), the method further comprising: welding the filter layer (120) and the cover layer (130) to the component of the recipient (100) by arranging welds (140) such that between two welds (140), welds tunnels (150) filled with filter material (120) are formed, which are intended to enable gas exchange between the interior of the recipient (100) and an area externally of the recipient (100).

An air filter including two opposing open ends, and a filter area circumferentially enclosing a cavity in between. The first open end frictionally and sealingly engages the filter housing including an air port, while the second end engages the housing to close the second end from passage of air. The filter area may be reinforced to provide a durable, reusable filter. The filter material may be selected to provide depth loading and increase the particulate capacity of the filter.

An air filter including two opposing open ends, and a filter area circumferentially enclosing a cavity in between. The first open end frictionally and sealingly engages the filter housing including an air port, while the second end engages the housing to close the second end from passage of air. The filter area may be reinforced to provide a durable, reusable filter. The filter material may be selected to provide depth loading and increase the particulate capacity of the filter.