WO2012030810A1 - Recirculating air-filtration unit - Google Patents

Recirculating air-filtration unit Download PDF

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Publication number
WO2012030810A1
WO2012030810A1 PCT/US2011/049709 US2011049709W WO2012030810A1 WO 2012030810 A1 WO2012030810 A1 WO 2012030810A1 US 2011049709 W US2011049709 W US 2011049709W WO 2012030810 A1 WO2012030810 A1 WO 2012030810A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
plenum
carbon
air
set out
Prior art date
Application number
PCT/US2011/049709
Other languages
French (fr)
Inventor
William K. Blewett
Original Assignee
Battelle Memorial Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Battelle Memorial Institute filed Critical Battelle Memorial Institute
Publication of WO2012030810A1 publication Critical patent/WO2012030810A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B01D53/0431—Beds with radial gas flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
    • F24F8/158—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using active carbon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/45—Gas separation or purification devices adapted for specific applications
    • B01D2259/4508—Gas separation or purification devices adapted for specific applications for cleaning air in buildings

Definitions

  • the present invention is related to a recirculating air-filtration apparatus and more specifically to such an apparatus for use in removing aerosols and chemical vapors from an enclosed space such as an airlock or room.
  • a carbon adsorber in an air-filtration apparatus, wherein the carbon adsorber comprises loose carbon granules packed in a round adsorber housing or a pleated carbon filter material.
  • additional pleats are added to the carbon material in order to increase the surface area of the filter material.
  • more pleats results in very sharp bends, which sometimes results in breaks in the carbon layer allowing air bypasses to develop.
  • a recirculating air- filtration apparatus comprising: a housing having an entrance and an exit; filter structure provided in the housing for removing particulates from air passing through the housing; and a carbon adsorber comprising a plurality of rolled carbon- loaded material cylinders through which the air passes as it moves through the housing.
  • the housing may define first and second inner cavities and a plenum communicating with the first and second cavities.
  • the apparatus may further comprise a motorized impeller in the plenum for causing air to flow into the housing, through the first inner cavity, through the plenum, and then through the second inner cavity.
  • the filter structure may be located in the first inner cavity, the motorized impeller may be provided in the plenum and the carbon adsorber may be located in the second inner cavity.
  • the filter structure may comprise at least one HEPA filter, such as a radial- flow H EPA filter.
  • the carbon adsorber may further comprise a plate including a plurality of bores, each of the bores being substantially fully covered by an end of one of the rolled carbon-loaded material cylinders.
  • a recirculating air-filtration apparatus comprising: a housing having an entrance and an exit, and a carbon adsorber comprising a plurality of rolled carbon-loaded material cylinders, wherein each cylinder may have an axially extending opening into which air passes prior to moving radially out through the cylinder.
  • the housing may define first and second inner cavities and a plenum communicating with the first and second cavities.
  • the apparatus may further comprise a motorized impeller in the plenum for causing air to flow into the housing, through the first inner cavity, through the plenum, and then through the second inner cavity.
  • the carbon adsorber may further comprise a first plate including a plurality of bores. Each of the bores may be substantially fully covered by a first end of one of the rolled carbon-loaded material cylinders.
  • the carbon adsorber may further comprise a generally solid second plate for engaging and blocking second ends of the cylinders.
  • Fig. 1 is a side view with a side partially removed of a recirculating air-filtration apparatus of the present invention
  • Fig. 2 is a perspective view of the apparatus illustrated in Fig. 1 ;
  • Fig. 3 is a view of a carbon adsorber of the apparatus illustrated in Fig. 1 .
  • a recirculating air-filtration apparatus 10, constructed in accordance with the present invention, is illustrated in Figs. 1 and 2.
  • the apparatus 10 is capable of being used in an enclosed space such as an airlock or a room in an office, house, commercial building and the like.
  • the apparatus 10 comprises a housing 20 having a top 20A, bottom 20B, a first side 20C, a second side 20D, an entrance portion 20E and an exit portion 20F.
  • a first opening 120E defining an entrance into a first inner cavity Ci within the housing 20 is provided in the entrance portion 20E.
  • a second opening 120F defining an exit from a second inner cavity C2 within the housing 20 is provided in the exit portion 20F.
  • the first and second inner cavities Ci and C2 are separated from one another by an internal wall 20G, sealed at the sides 20C and 20D, top 20A and bottom 20B, and provided within the housing 20.
  • the housing 20 may have a length L, which may fall within a range of from about 2 feet to about 4 feet, a width W, which may fall within a range of from about 18 inches to about 24 inches, and a height H, which may fall within a range of from about 20 inches to about 40 inches.
  • the housing 20 further comprises a plenum P located below and in
  • a plenum entrance 60A and a plenum exit 60B see Fig. 1 .
  • air is pulled by a motorized impeller 40 through the entrance 120E into the first inner cavity Ci , passes through the plenum P and then moves into and through the second inner cavity C2 before exiting the apparatus 10 through the exit 120F.
  • the air-filtration apparatus 10 further comprises one or more ring-shaped radial-flow high-efficiency particulate air (HEPA) filters.
  • HEPA high-efficiency particulate air
  • first and second ring-shaped HEPA filters 30 and 32 are provided in the first inner cavity Ci , both having an inner diameter greater than a diameter of the plenum entrance 60A.
  • the HEPA filters 30 and 32 are positioned so as to
  • the second HEPA filter 32 is stacked directly on top of the first filter 30, if two HEPA filters are employed. Air flowing through the entrance 120E into the first inner cavity Ci passes radially through the walls of the filters 30 and 32 into inner cavities 30A and 32A of the filters 30 and 32. From the inner cavities 30A and 32A, the air passes through the plenum entrance 60A into the plenum P.
  • the HEPA filters 30 and 32 function to remove particulates, e.g., solid or liquid aerosols, from the air flowing through the apparatus 10.
  • the motorized impeller 40 i.e., a fan, is provided in the plenum P directly below the first inner cavity Ci in the illustrated embodiment for pulling air through the entrance 120E into the first inner cavity Ci , and into the plenum P, and to force the air through the plenum P, into and through an adsorber 50 in the second inner cavity C 2 , and out the second inner cavity C 2 via the exit 120F.
  • the volumetric airflow through the apparatus 10 can be controlled via a variable speed controller to fall within the range of from about 200 ft 3 /minute to about 2000 ft 3 /minute and preferably is about 1000 ft 3 /minute and can be switched on for continuous operation or put on a timer for up to 30 minutes.
  • the adsorber 50 is provided in the second inner cavity C 2 to remove chemical vapors, depending upon the type of carbon or adsorbent used in the adsorber 50, from air flowing through the apparatus 10, see Figs. 1 -3.
  • the adsorber 50 comprises in the illustrated embodiment first and second plates 52 and 54 and a plurality of rolled carbon-loaded material cylinders 56 positioned lengthwise between the plates 52 and 54. Hence, the cylinders of carbon-loaded material 56 are vertically
  • Each cylinder of carbon-loaded material 56 may be formed from permeable carbon-loaded sheets rolled into the shape of a cylinder having an opening 56A, see Fig. 3, extending axially through the entire extent of the cylinder 56 and opposing first and second open ends.
  • the number of layers rolled into a cylinder varies with the desired flow rate, desired removal efficiency, and capability of the motorized impeller 40 in terms of pressure and flow.
  • Each cylinder 56 may have a diameter of about 4 inches and length of about 20 inches.
  • the first plate 52 has a plurality of bores 52A, each corresponding to one of the cylinders 56, see Fig. 3.
  • the diameter of each bore 52A is equal to or smaller than a diameter of the opening 56A within each material cylinder 56.
  • Each carbon- loaded material cylinder 56 is positioned relative to the first plate 52 so that the first end of the cylinder completely covers a corresponding bore 52A.
  • the second plate 54 is solid without bores and serves to block the upper second open ends of the cylinders 56.
  • the first plate 52 is positioned over the plenum exit 60B.
  • the outer periphery of the first plate 52 is larger than the housing structure defining the outer periphery of the plenum exit 60B, see Fig.
  • a carbon adsorber comprised loose carbon granules packed in a round adsorber housing or it comprised a pleated carbon filter material.
  • additional pleats would be added to the carbon material in order to increase the surface area of the filter material.
  • more pleats results in very sharp bends, which sometimes results in breaks in the carbon layer allowing air bypasses to develop.
  • pleats it is difficult to employ multiple layers of the material. It is believed that this invention allows for maximizing surface area of carbon filtering material within a given volume while minimizing the potential for air bypassing the carbon.
  • the apparatus is further believed to be advantageous as it provides a high rate of filtered air flow with a low air flow resistance and low noise level. It is also very space efficient. Further, because the apparatus entrance 120E and exit 120F are located apart, i.e., on opposite ends of the housing 20, it is believed there is a reduction in clean air flowing from the exit 120F and quickly re-entering the entrance 120E (i.e., short circuiting). Hence, an improvement in efficiency of removing contaminants from the air within a room or space is believed to result.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Treating Waste Gases (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

A recirculating air-filtration apparatus is provided comprising: a housing having an entrance and an exit; filter structure provided in the housing for removing particulates from air passing through the housing; and a carbon adsorber comprising a plurality of rolled carbon-loaded material cylinders through which the air passes as it moves through the housing.

Description

RECIRCULATING AIR-FILTRATION UNIT
TECHNICAL FIELD
The present invention is related to a recirculating air-filtration apparatus and more specifically to such an apparatus for use in removing aerosols and chemical vapors from an enclosed space such as an airlock or room.
BACKGROUND ART
It is known to use a carbon adsorber in an air-filtration apparatus, wherein the carbon adsorber comprises loose carbon granules packed in a round adsorber housing or a pleated carbon filter material. In order to improve filtering capability for the filter material, additional pleats are added to the carbon material in order to increase the surface area of the filter material. However, more pleats results in very sharp bends, which sometimes results in breaks in the carbon layer allowing air bypasses to develop. Also, with pleats, it is difficult to employ multiple layers of material.
DISCLOSURE OF INVENTION
In accordance with a first aspect of the present invention, a recirculating air- filtration apparatus is provided comprising: a housing having an entrance and an exit; filter structure provided in the housing for removing particulates from air passing through the housing; and a carbon adsorber comprising a plurality of rolled carbon- loaded material cylinders through which the air passes as it moves through the housing.
The housing may define first and second inner cavities and a plenum communicating with the first and second cavities.
The apparatus may further comprise a motorized impeller in the plenum for causing air to flow into the housing, through the first inner cavity, through the plenum, and then through the second inner cavity.
The filter structure may be located in the first inner cavity, the motorized impeller may be provided in the plenum and the carbon adsorber may be located in the second inner cavity. The filter structure may comprise at least one HEPA filter, such as a radial- flow H EPA filter.
The carbon adsorber may further comprise a plate including a plurality of bores, each of the bores being substantially fully covered by an end of one of the rolled carbon-loaded material cylinders.
In accordance with a second aspect of the present invention, a recirculating air-filtration apparatus is provided comprising: a housing having an entrance and an exit, and a carbon adsorber comprising a plurality of rolled carbon-loaded material cylinders, wherein each cylinder may have an axially extending opening into which air passes prior to moving radially out through the cylinder.
The housing may define first and second inner cavities and a plenum communicating with the first and second cavities.
The apparatus may further comprise a motorized impeller in the plenum for causing air to flow into the housing, through the first inner cavity, through the plenum, and then through the second inner cavity.
The carbon adsorber may further comprise a first plate including a plurality of bores. Each of the bores may be substantially fully covered by a first end of one of the rolled carbon-loaded material cylinders.
The carbon adsorber may further comprise a generally solid second plate for engaging and blocking second ends of the cylinders.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 is a side view with a side partially removed of a recirculating air-filtration apparatus of the present invention;
Fig. 2 is a perspective view of the apparatus illustrated in Fig. 1 ; and
Fig. 3 is a view of a carbon adsorber of the apparatus illustrated in Fig. 1 .
MODES FOR CARRYING OUT THE INVENTION
A recirculating air-filtration apparatus 10, constructed in accordance with the present invention, is illustrated in Figs. 1 and 2. The apparatus 10 is capable of being used in an enclosed space such as an airlock or a room in an office, house, commercial building and the like. The apparatus 10 comprises a housing 20 having a top 20A, bottom 20B, a first side 20C, a second side 20D, an entrance portion 20E and an exit portion 20F. A first opening 120E defining an entrance into a first inner cavity Ci within the housing 20 is provided in the entrance portion 20E. A second opening 120F defining an exit from a second inner cavity C2 within the housing 20 is provided in the exit portion 20F. The first and second inner cavities Ci and C2 are separated from one another by an internal wall 20G, sealed at the sides 20C and 20D, top 20A and bottom 20B, and provided within the housing 20. The housing 20 may have a length L, which may fall within a range of from about 2 feet to about 4 feet, a width W, which may fall within a range of from about 18 inches to about 24 inches, and a height H, which may fall within a range of from about 20 inches to about 40 inches.
The housing 20 further comprises a plenum P located below and in
communication with the first and second inner cavities Ci and C2 via a plenum entrance 60A and a plenum exit 60B, see Fig. 1 . As will be discussed further below, air is pulled by a motorized impeller 40 through the entrance 120E into the first inner cavity Ci , passes through the plenum P and then moves into and through the second inner cavity C2 before exiting the apparatus 10 through the exit 120F.
The air-filtration apparatus 10 further comprises one or more ring-shaped radial-flow high-efficiency particulate air (HEPA) filters. In the illustrated
embodiment, first and second ring-shaped HEPA filters 30 and 32 are provided in the first inner cavity Ci , both having an inner diameter greater than a diameter of the plenum entrance 60A. The HEPA filters 30 and 32 are positioned so as to
encompass the plenum entrance 60A. As illustrated in Fig. 1 , the second HEPA filter 32 is stacked directly on top of the first filter 30, if two HEPA filters are employed. Air flowing through the entrance 120E into the first inner cavity Ci passes radially through the walls of the filters 30 and 32 into inner cavities 30A and 32A of the filters 30 and 32. From the inner cavities 30A and 32A, the air passes through the plenum entrance 60A into the plenum P. The HEPA filters 30 and 32 function to remove particulates, e.g., solid or liquid aerosols, from the air flowing through the apparatus 10.
The motorized impeller 40, i.e., a fan, is provided in the plenum P directly below the first inner cavity Ci in the illustrated embodiment for pulling air through the entrance 120E into the first inner cavity Ci , and into the plenum P, and to force the air through the plenum P, into and through an adsorber 50 in the second inner cavity C2, and out the second inner cavity C2 via the exit 120F. The volumetric airflow through the apparatus 10 can be controlled via a variable speed controller to fall within the range of from about 200 ft3/minute to about 2000 ft3/minute and preferably is about 1000 ft3/minute and can be switched on for continuous operation or put on a timer for up to 30 minutes.
The adsorber 50 is provided in the second inner cavity C2 to remove chemical vapors, depending upon the type of carbon or adsorbent used in the adsorber 50, from air flowing through the apparatus 10, see Figs. 1 -3. The adsorber 50 comprises in the illustrated embodiment first and second plates 52 and 54 and a plurality of rolled carbon-loaded material cylinders 56 positioned lengthwise between the plates 52 and 54. Hence, the cylinders of carbon-loaded material 56 are vertically
positioned within the second inner cavity C2- Each cylinder of carbon-loaded material 56 may be formed from permeable carbon-loaded sheets rolled into the shape of a cylinder having an opening 56A, see Fig. 3, extending axially through the entire extent of the cylinder 56 and opposing first and second open ends. The number of layers rolled into a cylinder varies with the desired flow rate, desired removal efficiency, and capability of the motorized impeller 40 in terms of pressure and flow. Each cylinder 56 may have a diameter of about 4 inches and length of about 20 inches.
The first plate 52 has a plurality of bores 52A, each corresponding to one of the cylinders 56, see Fig. 3. The diameter of each bore 52A is equal to or smaller than a diameter of the opening 56A within each material cylinder 56. Each carbon- loaded material cylinder 56 is positioned relative to the first plate 52 so that the first end of the cylinder completely covers a corresponding bore 52A. The second plate 54 is solid without bores and serves to block the upper second open ends of the cylinders 56. The first plate 52 is positioned over the plenum exit 60B. The outer periphery of the first plate 52 is larger than the housing structure defining the outer periphery of the plenum exit 60B, see Fig. 1 , and is sealed to the housing structure defining the outer periphery of the plenum exit 60B via a gasket (not shown). Hence, air leaving the plenum P must pass through the bores 52A in the first plate 52, then flow axially into and eventually radially through the carbon-loaded material cylinders 56. As the air passes through the cylinders 56, vapors in the air are removed. After leaving the carbon-loaded material cylinders 56, the air passes into the volume of the second inner cavity C2 not occupied by the cylinders 56 and then leaves the second inner cavity C2 through the exit 120F.
As noted above, in the prior art, a carbon adsorber comprised loose carbon granules packed in a round adsorber housing or it comprised a pleated carbon filter material. In order to improve filtering capability for the filter material, additional pleats would be added to the carbon material in order to increase the surface area of the filter material. However, more pleats results in very sharp bends, which sometimes results in breaks in the carbon layer allowing air bypasses to develop. Also, with pleats, it is difficult to employ multiple layers of the material. It is believed that this invention allows for maximizing surface area of carbon filtering material within a given volume while minimizing the potential for air bypassing the carbon. The apparatus is further believed to be advantageous as it provides a high rate of filtered air flow with a low air flow resistance and low noise level. It is also very space efficient. Further, because the apparatus entrance 120E and exit 120F are located apart, i.e., on opposite ends of the housing 20, it is believed there is a reduction in clean air flowing from the exit 120F and quickly re-entering the entrance 120E (i.e., short circuiting). Hence, an improvement in efficiency of removing contaminants from the air within a room or space is believed to result.
While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

Claims

CLAIMS What is claimed is:
1 . A recirculating air-filtration apparatus comprising:
a housing having an entrance and an exit;
filter structure provided in said housing for removing particulates from air passing through said housing; and
a carbon adsorber comprising a plurality of rolled carbon-loaded material cylinders through which the air passes as it moves through said housing.
2. The apparatus as set out in claim 1 , wherein said housing defines first and second inner cavities and a plenum communicating with said first and second cavities.
3. The apparatus as set out in claim 2, further comprising a motorized impeller in the plenum for causing air to flow into said housing, through said first inner cavity, through said plenum, and then through said second inner cavity.
4. The apparatus as set out in claim 3, wherein said filter structure is located in said first inner cavity, said motorized impeller is provided in said plenum and said carbon adsorber is located in said second inner cavity.
5. The apparatus as set out in claim 1 , wherein said filter structure comprises at least one HEPA filter.
6. The apparatus as set out in claim 4, wherein said HEPA filter comprises a radial-flow HEPA filter.
7. The apparatus as set out in claim 1 , wherein said carbon adsorber further comprises a plate including a plurality of bores, each of said bores being substantially fully covered by an end of one of said rolled carbon-loaded material cylinders.
8. A recirculating air-filtration apparatus comprising: a housing having an entrance and an exit; and
a carbon adsorber comprising a plurality of rolled carbon-loaded material cylinders, each said cylinder having an axially extending opening into which air passes prior to moving radially out through said cylinder.
9. The apparatus as set out in claim 8, wherein said housing defines first and second inner cavities and a plenum communicating with said first and second cavities.
10. The apparatus as set out in claim 9, further comprising a motorized impeller in the plenum for causing air to flow into said housing, through said first inner cavity, through said plenum, and then through said second inner cavity.
1 1 . The apparatus as set out in claim 8, wherein said carbon adsorber further comprises a first plate including a plurality of bores, each of said bores being substantially fully covered by a first end of one of said rolled carbon-loaded material cylinders.
12. The apparatus as set out in claim 1 1 , wherein said carbon adsorber further comprises a generally solid second plate for engaging and blocking second ends of said cylinders.
PCT/US2011/049709 2010-09-01 2011-08-30 Recirculating air-filtration unit WO2012030810A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37900410P 2010-09-01 2010-09-01
US61/379,004 2010-09-01

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969095A (en) * 1973-08-25 1976-07-13 Shigeru Kurahashi Air filter apparatus
WO1994029001A1 (en) * 1993-06-11 1994-12-22 Abb Miljø Norsk Viftefabrikk A.S Adsorption filter
EP0909577A2 (en) * 1997-10-15 1999-04-21 Seka Schutzbelüftung GmbH Mobile appparatus for purifying polluted air
US6152996A (en) * 1997-03-05 2000-11-28 Air-Maze Corporation Air cleaner element having incorporated sorption element
US20060249027A1 (en) * 2005-05-05 2006-11-09 Adolphsen Tony L Rigid adsorption apparatus, and methods

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969095A (en) * 1973-08-25 1976-07-13 Shigeru Kurahashi Air filter apparatus
WO1994029001A1 (en) * 1993-06-11 1994-12-22 Abb Miljø Norsk Viftefabrikk A.S Adsorption filter
US6152996A (en) * 1997-03-05 2000-11-28 Air-Maze Corporation Air cleaner element having incorporated sorption element
EP0909577A2 (en) * 1997-10-15 1999-04-21 Seka Schutzbelüftung GmbH Mobile appparatus for purifying polluted air
US20060249027A1 (en) * 2005-05-05 2006-11-09 Adolphsen Tony L Rigid adsorption apparatus, and methods

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