# US 2021/0275953 A1 · Filter Device, Air Conducting Hose with Filter Element, Tunnel, and Use of the Filter Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0275953 A1 - Document ID: US20210275953A1 - Status: Published application - Kind: A1 - Application number: 17/188,677 - Filed: 2021-03-01 - Published: 2021-09-09 - Earliest claimed: 2020-03-04 - Assignees: Mann+Hummel GmbH - Applicants: MANN+HUMMEL GmbH - Inventors: Christoph Schulz; Tobias Warth; Marc Hittinger; Jens Gusek; Maximilian Bauch; Thilo Mueller; Anja Koronai-Bauer; Sylvain Michel Tchale; Roman Eder - Web page: https://patentgrep.com/patent/US20210275953A1 ## CPC - B01D 46/58: connected in parallel - B01D 46/0002: {Casings; Housings; Frame constructions} - B01D 46/0005: {Mounting of filtering elements within casings, housings or frames (B01D46/2422 takes precedence)} - B01D 46/0036: {by adsorption or absorption} - B01D 46/0041: {for feeding} - B01D 46/12: in multiple arrangements - B01D 46/16: arranged on non-filtering conveyors {or supports} - B01D 46/521: {using folded, pleated material} - F24F 8/108: using dry filter elements - F24F 8/99: for treating air sourced from urban areas, e.g. from streets - B01D 2253/102: Carbon - B01D 2253/108: Zeolites - B01D 2265/022: Bayonet connecting means - B01D 2265/05: Special adapters for the connection of filters or parts of filters - B01D 2273/30: Means for generating a circulation of a fluid in a filtration system, e.g. using a pump or a fan - B01D 2279/40: for cleaning of environmental air, e.g. by filters installed on vehicles or on streets - F24F 8/158: using active carbon - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) ## Abstract A filter device for ambient air filtration has a blower housing with air inlet and air outlet. A device for generating an air flow is arranged in the blower housing and generates an air flow in operation from air inlet to air outlet. A flexible air conducting hose is provided with a first open end connected to the air outlet of the blower housing and with a second closed end. The flexible air conducting hose has openings arranged between first open end and second closed end. Filter elements are arranged in the openings, respectively. The filter elements separate a raw side inside the air conducting hose from a clean side downstream of the filter element. The air conducting hose is inflated in operation of the device by the air flow. The flexible air conducting hose has a reduced air permeability compared to the air permeability of the filter elements. ## Claims ### Claim 1 A filter device for ambient air filtration, the filter device comprising: a blower housing comprising an air inlet and an air outlet; a device configured to generate an air flow arranged in the blower housing, wherein the device configured to generate an air flow generates in operation an air flow from the air inlet to the air outlet; a flexible air conducting hose comprising a first open end configured to be connected to the air outlet of the blower housing and further comprising a second closed end; wherein the flexible air conducting hose comprises one or more openings arranged between the first open end and the second closed end; one or more filter elements, each filter element arranged in one of the openings, respectively, and separating a raw side inside the flexible air conducting hose from a clean side downstream of the filter element; wherein the flexible air conducting hose is configured to be inflated by the air flow generated in operation of the device configured to generate an air flow; and wherein the flexible air conducting hose comprises a reduced air permeability in comparison to an air permeability of the filter elements. ### Claim 2 (depends on 1) The filter device according to claim 1, wherein the flexible air conducting hose is air-impermeable. ### Claim 3 (depends on 1) The filter device according to claim 1, wherein the flexible air conducting hose comprises an air-impermeable material or is comprised of an air-impermeable material. ### Claim 4 (depends on 1) The filter device according to claim 1, wherein an inner cross-sectional area of the flexible air conducting hose decreases from the first open end toward the second closed end. ### Claim 5 (depends on 1) The filter device according to claim 1, wherein the one or more openings each comprise a rim region surrounding the opening, wherein the one or more filter elements are fluid-tightly connected to the rim region, respectively. ### Claim 6 (depends on 5) The filter device according to claim 5, wherein the one or more filter elements are fluid-tightly connected by welding, gluing and/or pressing. ### Claim 7 (depends on 1) The filter device according to claim 1, wherein the flexible air conducting hose comprises two of the openings and two of the filter elements. ### Claim 8 (depends on 1) The filter device according to claim 1, wherein the flexible air conducting hose comprises three of the openings and three of the filter elements. ### Claim 9 (depends on 1) The filter device according to claim 1, wherein the flexible air conducting hose comprises a plurality of the openings, wherein the plurality of the openings are spaced apart from each other in a length direction of the flexible air conducting hose or the plurality of the openings are arranged oppositely positioned to each other. ### Claim 10 (depends on 1) The filter device according to claim 1, wherein the flexible air conducting hose comprises a plurality of the openings, wherein the plurality of the openings are spaced apart from each other in a length direction of the flexible air conducting hose and are arranged oppositely positioned to each other. ### Claim 11 (depends on 1) The filter device according to claim 1, further comprising a support device supporting the flexible air conducting hose at least partially along a length extension the flexible air conducting hose. ### Claim 12 (depends on 11) The filter device according to claim 11, wherein the support device comprises an inner support frame extending inside of the flexible air conducting hose, wherein the inner support frame is connected to the blower housing at least in a region of the first open end of the flexible air conducting hose. ### Claim 13 (depends on 11) The filter device according to claim 11, wherein the support device comprises an outer support frame extending outside of the flexible air conducting hose, wherein the outer support frame surrounds the flexible air conducting hose. ### Claim 14 (depends on 13) The filter device according to claim 13, wherein the flexible air conducting hose is fastened at least with the second closed end to the outer support frame. ### Claim 15 (depends on 14) The filter device according to claim 14, wherein the flexible air conducting hose is fastened to the outer support frame by a rope or a wire. ### Claim 16 (depends on 1) The filter device according to claim 1, wherein the filter elements each comprise a polygonal shape and each comprise at least one folded bellows of a filter medium. ### Claim 17 (depends on 16) The filter device according to claim 16, wherein the filter medium comprises at least one adsorber selected from the group consisting of active carbon and zeolite. ### Claim 18 (depends on 1) The filter device according to claim 1, wherein the blower housing comprises two of said air outlet and two of said flexible air conducting hose, respectively, wherein the two air outlets are arranged at sides of the blower housing that are facing away from each other. ### Claim 19 (depends on 1) The filter device according to claim 1, wherein the air conducting hose is connected by a detachable hose interface to the air outlet of the blower housing. ### Claim 20 (depends on 19) The filter device according to claim 19, wherein the detachable hose interface comprises a first interface part arranged at the blower housing and a second interface part arranged at the first open end of the flexible air conducting hose. ### Claim 22 (depends on 19) The filter device according to claim 19, wherein the detachable hose interface comprises at least one thread and/or bayonet connecting element comprising a predetermined key-lock code. ### Claim 23 (depends on 1) The filter device according to claim 1, wherein the flexible air conducting hose comprises a flow guiding structure arranged in an interior of the flexible air conducting hose. ### Claim 24 (depends on 23) The filter device according to claim 23, wherein the flow guiding structure is comprised of a single-layer or multilayer fabric and/or film material. ### Claim 25 (depends on 23) The filter device according to claim 23, wherein the flow guiding structure forms at least two compartments in the interior of the flexible air conducting hose and the at least two compartments are at least partially closed off relative to each other. ### Claim 26 An air conducting hose for a filter device, the air conducting hose comprising: a first open end configured to be connected to an air outlet of a blower housing of the filter device and further comprising a second closed end; one or more openings arranged between the first open end and the second closed end; one or more filter elements, each filter element arranged in one of the openings, respectively, and separating a raw side inside the air conducting hose from a clean side downstream of the filter element; wherein the air conducting hose is flexible and comprises a reduced air permeability in comparison to an air permeability of the filter elements. ### Claim 27 (depends on 26) The air conducting hose according to claim 26, further comprising an interface part of a hose interface at the first open end. ### Claim 28 (depends on 27) The air conducting hose according to claim 27, wherein the interface part comprises at least one thread and/or bayonet connecting element comprising a predetermined lock-key code. ### Claim 29 (depends on 1) A tunnel comprising a tunnel floor, a tunnel ceiling, and at least one tunnel wall, wherein the tunnel wall has a curved cross section shape, wherein at or in the at least one curved tunnel wall a filter device according to claim 1 is arranged. ### Claim 30 (depends on 1) A method of filtering ambient air in a tunnel, the method comprising: arranging a filter device according to claim 1 in the tunnel and passing the ambient air through the filter device.