# US 11,992,174 B2 · Environmental control unit for dust and odor control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,992,174 B2 - Document ID: US11992174B2 - Status: Granted - Kind: B2 - Application number: 17/749,512 - Filed: 2022-05-20 - Published: 2022-09-01 - Granted: 2024-05-28 - Earliest claimed: 2017-10-20 - Assignees: Enviropur LLC - Applicants: Enviropur LLC - Inventors: Dave Kette - Web page: https://patentgrep.com/patent/US11992174B2 ## CPC - A47L 9/102: {Dust separators (cyclones A47L9/16)} - A47L 7/0085: {adapted for special purposes not related to cleaning} - A47L 7/0095: {Suction cleaners or attachments adapted to collect dust or waste from power tools} - A47L 9/12: Dry filters - A47L 9/122: {flat} - A47L 9/16: Arrangement or disposition of cyclones or other devices with centrifugal action - A47L 9/2821: {Pressure, vacuum level or airflow} - A47L 9/2842: {Suction motors or blowers} - A47L 9/2868: {Arrangements for power supply of vacuum cleaners or the accessories thereof} - B01D 45/16: generated by the winding course of the gas stream {, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes} - B01D 46/446: {by pressure measuring} - B01D 46/46: automatic - B01D 46/62: connected in series - B04C 9/00: Combinations with other devices, e.g. fans, {expansion chambers, diffusors, water locks}(with filters B01D50/00) - B01D 50/20: Combinations of devices covered by groups B01D45/00 and B01D46/00 - B01D 2279/40: for cleaning of environmental air, e.g. by filters installed on vehicles or on streets - B01D 2279/55: for cleaning appliances, e.g. suction cleaners - B04C 2009/002: {with external filters} - A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08) - 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) - B04C: APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES ({centrifugal separation of water from steam B01D45/12;} jet mills B02C19/06; {wind sifters B07B7/00;} cyclonic type combustion apparatus F23; {vortex burners for cyclone-type combustion apparatus F23D1/02; cyclonic type combustion apparatus for gas turbines F23R3/00}) ## Abstract An environmental control unit comprises a housing, a vacuum cleaner, a filtration unit, and a blower. The vacuum cleaner is positioned in the housing and is configured to receive a tool contaminant stream produced by at least one tool. The vacuum cleaner filters particulate matter from the tool contaminant stream, thereby producing a filtered air stream. The filtration unit is also positioned within the housing and comprises at least one filter. The blower is positioned within the housing downstream of the filtration unit. The blower is configured to create negative air pressure within the second compartment to draw an area contaminant stream from an exterior of the environmental control unit into the housing. A second blower may also be present. The blower draws the filtered air stream and the area contaminant stream through the at least one filter in the filtration unit to produce a filtered mixture stream. ## Claims ### Claim 1 An environmental control unit comprising: a housing; the housing configured to receive a tool contaminant stream from a tool coupled to the housing; a cyclonic dust separator configured to separate solid particulate matter from the tool contaminant stream and exhaust an air stream from the cyclonic dust separator; a filtration unit comprising at least one filter, the filtration unit positioned in the housing; a blower positioned within the housing downstream of the filtration unit, wherein the blower creates negative air pressure within the housing to draw an area contaminant stream from an exterior of the environmental control unit into the housing, wherein the blower draws the air stream and the area contaminant stream through the filtration unit to produce a filtered mixture stream; and a controller that controls power within the environmental control unit and comprises a soft start module configured to limit amperage of the environmental control unit to under 20 Amps, thereby maintaining current in-flow under electrical surges on start-up, while providing sufficient power for operation of the blower and the tool upon start-up of the blower, a second blower or the tool, wherein the tool draws electricity from the environmental control unit; wherein the blower is driven by a variable speed controlled motor. ### Claim 2 (depends on 1) The environmental control unit of claim 1, wherein the controller controls a speed of the variable speed controlled motor in accordance with a limit of the amperage for the environmental control unit. ### Claim 3 (depends on 1) The environmental control unit of claim 1 wherein the variable speed controlled motor is a variable frequency drive. ### Claim 4 (depends on 1) The environmental control unit of claim 1, wherein the housing further comprises an electrical outlet for the tool that produces the contaminant stream or another tool. ### Claim 5 (depends on 4) The environmental control unit of claim 4, wherein the controller is configured to prioritize providing stable current to the variable speed controlled motor when the tool is powered on or off. ### Claim 6 (depends on 1) The environmental control unit of claim 1, wherein the controller increases a speed of the blower as particulate matter from the tool contaminant stream and the area contaminant stream accumulate on the at least one filter to maintain a substantially constant flow rate through the at least one filter, in accordance with the limit of the amperage for the environmental control unit. ### Claim 7 (depends on 1) The environmental control unit of claim 1 further comprising: a sensor that senses a pressure across the at least one filter, and signals pressure information to a controller, the controller being configured to increase the speed of the blower to maintain a substantially constant pressure across the at least one filter, in accordance with the limit of the amperage for the environmental control unit. ### Claim 8 (depends on 1) The environmental control unit of claim 1, wherein the soft start module works in conjunction with one or more variable frequency drives to allow for operation of the blower, the second blower, and the tool to stay under the limit of the amperage. ### Claim 9 (depends on 1) The environmental control unit of claim 1, wherein the limit of the amperage is under 15 Amps. ### Claim 10 (depends on 8) The environmental control unit of claim 8, wherein the limit of the amperage is under 15 Amps. ### Claim 11 (depends on 1) The environmental control unit of claim 1, wherein the environmental control unit is configured for moving between renovation sites. ### Claim 12 (depends on 11) The environmental control unit of claim 11, wherein the housing is coupled to means for facilitating movement of the environmental control unit between renovation sites. ### Claim 13 (depends on 12) The environmental control unit of claim 12, wherein the means for facilitating movement are wheels. ### Claim 14 (depends on 11) The environmental control unit of claim 11, wherein the housing has an exhaust opening configured for coupling to lay flat ducting. ### Claim 15 (depends on 1) The environmental control unit of claim 1, wherein the second blower is configured to pull air from a hose coupled to the tool. ### Claim 16 (depends on 1) The environmental control unit of claim 1, wherein the variable speed motor is configured to adjust a speed of the blower and the controller receives information from a differential pressure transmitter; and upon sensing a change of pressure in a room in which the environmental control unit resides, the controller controls the variable speed motor to adjust the speed of the blower. ### Claim 17 (depends on 16) The environmental control unit of claim 16, wherein the variable speed motor adjusts the speed of the blower to maintain a substantially constant negative pressure in a renovation space. ### Claim 18 An environmental control unit comprising: a housing, the housing configured to receive a tool contaminant stream from a tool coupled to the housing via a hose; a filtration unit comprising at least one filter, the filtration unit positioned in the housing; a first blower positioned within the housing downstream of the filtration unit, wherein the first blower creates negative air pressure within the housing to draw an area contaminant stream from an exterior of the environmental control unit into the housing, and a controller that controls power within the environmental control unit and comprises a soft start module configured to limit amperage of the environmental control unit to under 20 Amps; a second blower configured to pull air from the hose coupled to the tool; and at least the first blower is driven by a variable speed controlled motor:, wherein in an electrical circuit providing power to the second blower, the soft start module is electrically wired in series prior to the second blower. ### Claim 19 (depends on 18) The environmental control unit of claim 18, wherein the controller and the soft start module provide sufficient power for operation of the first blower, the second blower, and the tool upon start-up of the first blower, the second blower, or the tool, wherein the tool draws electricity from the environmental control unit. ### Claim 20 (depends on 18) The environmental control unit of claim 18, further comprising a three-position control switch for controlling the second blower that is in series and coupled to other circuit components capable of affecting current to the second blower.