# US 8,771,408 B2 · Range hood with liquid filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,408 B2 - Document ID: US8771408B2 - Status: Granted - Kind: B2 - Application number: 13/015,945 - Filed: 2011-01-28 - Published: 2011-11-10 - Granted: 2014-07-08 - Earliest claimed: 2008-07-29 - Assignees: Air Dynamics Industrial Systems Corporation - Applicants: Daniel P. Lehman; Daniel A. Lehman - Inventors: Daniel P. Lehman; Daniel A. Lehman - Web page: https://patentgrep.com/patent/US8771408B2 ## CPC - B01D 47/021: {by bubbling the gas through a liquid bath} - F24C 15/20: Removing cooking fumes (parts, details or accessories of cooking-vessels for withdrawing or condensing cooking vapours from such vessels A47J36/38) - B01D 2221/02: Small separation devices for domestic application, e.g. for canteens, industrial kitchen, washing machines - B01D 2247/08: Means for controlling the separation process - B01D 2247/107: using an unstructured demister, e.g. a wire mesh demister - B01D 2247/14: Fan arrangements for providing induced draft - 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) - F24C: DOMESTIC STOVES OR RANGES (exclusively for solid fuels F24B); DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION ## Abstract A range hood for a kitchen range or other similar appliance is disclosed. The range hood is adapted to be coupled to a blower to draw the contaminated effluent stream from the range into the hood. The effluent stream is drawn through a substantially horizontal perforated liquid support or impingement tray that is filled with a working liquid, and is then passed through a high-efficiency mist eliminator. The range hood offers a substantially straight airflow path from a point just inside the inlet to the outlet. The range hood also has a low profile, and offers direct access to its interior components for easy inspection and cleaning. ## Claims ### Claim 1 A range hood, comprising: an inlet and an outlet, the inlet being adapted to accept a contaminated effluent stream and the outlet being adapted to be connected directly or indirectly to a blower such that in an operational condition of the range hood, a pressure drop is maintained across the range hood from inlet to outlet, thus drawing the effluent stream from the inlet toward the outlet, the inlet and the outlet being arranged relative to one another such that a relatively straight airflow path is provided for the effluent stream from a point just inside the inlet to the outlet; a substantially horizontally-extending liquid support provided in the airflow path, the liquid support being constructed and arranged to support liquid and having a plurality of perforations such that, in the operational condition, liquid is supported on and retained by the liquid support at least in part by the pressure drop across the range hood, the liquid support being provided in the airflow path such that, in the operational condition, the contaminated effluent stream flows through the liquid support and any liquid supported thereon as it flows along the airflow path; an upper liquid inlet in fluid communication with a liquid source; a reservoir space adjacent to the liquid support, the reservoir space being constructed and arranged to accept and contain liquid from the liquid inlet; and a first partition between the reservoir space and the liquid support, the first partition being arranged such that when the reservoir space is filled to overflow, liquid from the reservoir space moves over the first partition and across the liquid support, thereby skimming the liquid supported on the liquid support; a second partition opposite the first partition on the other side of the liquid support, the second partition creating a drain space for material that is skimmed from the liquid support; and a cover extending over the second partition so as to define a gap between the second partition and the cover, the gap being sized so as to control the rate at which liquid and material is allowed to flow into the drain space. ### Claim 2 (depends on 1) The range hood of claim 1, further comprising a sump constructed and adapted to hold liquid, the sump being arranged relative to the liquid support such that liquid from the liquid support can drain into the sump. ### Claim 3 (depends on 2) The range hood of claim 2, wherein the liquid source comprises the sump. ### Claim 4 (depends on 1) The range hood of claim 1, further comprising a mist eliminator arranged in the airflow path between the liquid support and the outlet. ### Claim 5 (depends on 1) The range hood of claim 1, further comprising: a hood body enclosing the range hood; and one or more access doors in the hood body, the access doors being constructed and arranged such that the components of the range hood can be accessed through the access doors. ### Claim 6 (depends on 1) The range hood of claim 1, wherein the liquid support further comprises a number of baffles attached to the liquid support and extending upwardly therefrom, the baffles being arranged so as to divide and enclose a plurality of individual liquid areas along the liquid support, the height and arrangement of the baffles being such that liquid will be retained in the individual areas of the liquid support upon movement of the range hood. ### Claim 7 (depends on 1) The range hood of claim 1, wherein the liquid is water. ### Claim 8 (depends on 4) The range hood of claim 4, wherein the mist eliminator is above and in line with the liquid support and below and in line with the outlet. ### Claim 9 A range hood, comprising: an inlet and an outlet, the inlet being adapted to accept a contaminated effluent stream and the outlet being adapted to be connected directly or indirectly to a blower such that in an operational condition of the range hood, a pressure drop is maintained across the range hood from inlet to outlet, thus drawing the effluent stream from the inlet toward the outlet, the inlet and the outlet being arranged relative to one another such that a relatively straight airflow path is provided for the effluent stream from a point just inside the inlet to the outlet; a substantially horizontally-extending liquid support provided in the airflow path below and in line with the outlet, the liquid support being constructed and arranged to support liquid and having a plurality of perforations such that, in the operational condition, liquid is supported on and retained by the liquid support at least in part by the pressure drop across the range hood, the liquid support being provided in the airflow path such that, in the operational condition, the contaminated effluent stream flows through the liquid support and any liquid supported thereon as it flows along the airflow path; an upper liquid inlet in fluid communication with a liquid source; a reservoir space adjacent to the liquid support, the reservoir space being constructed and arranged to accept and contain liquid from the liquid inlet; and a first partition between the reservoir space and the liquid support, the first partition being arranged such that when the reservoir space is filled to overflow, liquid from the reservoir space moves over the first partition and across the liquid support, thereby skimming the liquid supported on the liquid support; a second partition opposite the first partition on the other side of the liquid support, the second partition creating a drain space for material that is skimmed from the liquid support; and a cover extending over the second partition so as to define a gap between the second partition and the cover, the gap being sized so as to control the rate at which liquid and material is allowed to flow into the drain space.