WO2016190788A1 - Odour suppressing air filtration system - Google Patents

Odour suppressing air filtration system Download PDF

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Publication number
WO2016190788A1
WO2016190788A1 PCT/SE2015/000033 SE2015000033W WO2016190788A1 WO 2016190788 A1 WO2016190788 A1 WO 2016190788A1 SE 2015000033 W SE2015000033 W SE 2015000033W WO 2016190788 A1 WO2016190788 A1 WO 2016190788A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
odour
sequence
filtration system
suppressing
Prior art date
Application number
PCT/SE2015/000033
Other languages
French (fr)
Inventor
Bo DOLK-PETERSSON
Original Assignee
Qlean Air Scandinavia Ab
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 Qlean Air Scandinavia Ab filed Critical Qlean Air Scandinavia Ab
Priority to PCT/SE2015/000033 priority Critical patent/WO2016190788A1/en
Publication of WO2016190788A1 publication Critical patent/WO2016190788A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/01—Deodorant compositions
    • A61L9/014—Deodorant compositions containing sorbent material, e.g. activated carbon
    • 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
    • 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
    • B01D53/26—Drying gases or vapours
    • B01D53/28—Selection of materials for use as drying agents
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
    • A61L2209/10—Apparatus features
    • A61L2209/14—Filtering means
    • 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
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B01D2253/108—Zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/90—Odorous compounds not provided for in groups B01D2257/00 - B01D2257/708

Definitions

  • the present invention relates to an odour suppressing air filtration system according to the introductory portion of the independent claim.
  • Active carbon filters are commonly used in air cleaning and in air cleaning using filters and, in particular in cleaning of air laden with cigarette smoke, the active carbon filters may tend to generate or let through undesirable odours. A means for effectively suppressing these odours is therefore required.
  • An object of the invention is therefore to provide an odour suppressing air filtration system which suppresses undesirable odours from the active carbon filters.
  • the invention relates to an air filtration system comprising a fan or pump that pumps air through a sequence of filters, where the sequence of filters comprises at least one active carbon filter AC, AC 1 -2, and an odour suppressing filter S.
  • the odour suppressing filter S comprises a main active substance that acts on the air by suppressing odours, where the main substance comprises a hygroscopic substance. With such an odour suppressing filter S undesirable odours coming from the active carbon filter are advantageously suppressed or prevented.
  • the odour suppressing filter S has as its main active substance a hygroscopic salt. In advantageous embodiments, the odour suppressing filter S has as its main active substance one or several of sodium chloride, potassium chloride or magnesium chloride.
  • the filter sequence further comprises at least a Zeolite filter Z, where the Zeolite filter Z is arranged after all the active carbon filters AC, AC 1-2 in the filter sequence.
  • the invention further relates to such a filter sequence, where the Zeolite filter Z is arranged after the odour suppressing filter S.
  • Fig. 1 shows a first embodiment of a filter sequence with an odour suppressing filter according to the invention.
  • Fig. 2 shows a second embodiment of the filter sequence with an odour suppressing filter.
  • Fig. 3 shows a third embodiment of the filter sequence with an odour suppressing filter. Description of preferred embodiments
  • the invention relates to an odour suppressing filter that constitutes one filter in a sequence of filters, used to clean contaminated air.
  • the filter sequence if arranged in an air tight fashion in containment with an inlet and an outlet.
  • the filter sequence is normally used in conjunction with a fan or a pump that makes air enter the inlet to the filter sequence, pass through the filters, and exit the filters through the outlet, as the arrows in the figures indicate.
  • the invention is directed towards the odour suppressing filter and the sequence of filters as such, the containment, the fan or any other necessary components are not depicted, and the figures just illustrates three general embodiments of the sequence of filter units that are denoted filter sequences which comprise an odour suppressing filter.
  • Fig. 1 shows a first embodiment of a filter sequence with an odour suppressing filter according to the invention, which comprises a sequence of three consecutive filters.
  • the first filter S is constituted by an odour suppressing filter and its influence makes air passing through the filter sequence getting a significantly reduced undesirable odour.
  • the odour suppressing filter S is generally constituted by a hygroscopic substance, and normally this hygroscopic substance is water soluble. More specifically, it comprises a hygroscopic salt, and a good example is filters based on table salt, NaCl.
  • Actual table salt filter typically contains about 95% table salt, but in addition to this other substances are also added, such as ferrocyanide, anticaking agents and other.
  • the first filter is followed by a second filter constituted by an active carbon filter AC.
  • the active carbon filter is primarily intended to adsorb gaseous substances that constitute contaminations in the air that passes through the filter, but may also to some extent act as a mechanical filter that blocks particles in the air.
  • active carbon filters When active carbon filters are used to clean air, in particular when they are used for cleaning cigarette smoke in air, the filter itself tends to generate gaseous substances that are not adsorbed by the filter, but passes through the filter and generates what to humans is experienced as undesirable odour.
  • the purpose of the odour suppressing filter S is to prevent such odours.
  • the active carbon filter AC follows a third filter M that is constituted by an ordinary mechanical filter, which is a filter that filters particles in the air that are too large to pass through the mechanical filter.
  • the mechanical filter is constituted by a filter of HEP A class HI 4, which for example is suitable for removing particles in air laden with particles from cigarette smoke.
  • Fig. 2 shows a second embodiment of the filter sequence with the odour suppressing air filter, which comprises five consecutive filter elements.
  • the filter sequence starts in the same way as in the first embodiment, with an odour suppressing filter S, having the same function as in the first embodiment.
  • the second embodiment of the filter sequence comprises two different active carbon filters ACl, AC2.
  • the odour suppressing filter S is followed by a second filter ACl that is constituted by a first CS active carbon filter, which is an active carbon filter produced from coconut shells.
  • a third filter M constituted by a mechanical HEPA filter class HI 4.
  • a fourth filter AC2 constituted by a second active carbon filter type GA.
  • the two active carbon filters are intentionally selected to be of different kinds, as they preferentially adsorb different substances in such a way that the two filters complement each other.
  • the effect of the odour suppressing filter S is sufficient to suppress undesirable odours from both the active carbon filters.
  • the second active carbon filter AC2 is followed by a fifth and last filter constituted by a Zeolite filter Z.
  • the Zeolite filter complements the adsorption in both the active carbon filters in a way corresponding to that in the second embodiment.
  • Fig. 3 shows a third embodiment of the filter sequence comprising six consecutive filter elements. The order of the filter elements is different from that of the previous embodiments.
  • the first filter element in the third embodiment is constituted by a first mechanical filter Ml, acting as a prefilter.
  • the second filter is a first active carbon filter AC1, followed by a third filter in the form of an odour suppressing filter S.
  • the fourth filter is constituted by a second active carbon filter AC2 and the fifth filter is a Zeolite filter Z.
  • the sixth and last filter is constituted by a second mechanical filter M2.
  • the odour suppressing filter S, the active carbon filters AC1, AC2 and the Zeolite filter Z may emit small amounts of particles that come from the active filtering substance, so the second mechanical filter M2 acts as an end filter that removes any such particles.
  • the two mechanical filters Ml, M2 are preferably different, such that their actions complement each other.
  • the two active carbon filters are preferably of different kinds, such that their joint effect is better than if two identical filters had been used.
  • each filter element is denoted filter, but by this is not necessarily meant a unit that removes a contamination, and instead elements are conceivable that adds a substance to the air flowing through the filter element.
  • An example is constituted by a hygroscopic salt filter. That absorbs moisture from the air passing through it until it has been saturated by water. If the humidity of the air passing through the salt filter falls, the salt will instead emit water vapour to the dry air passing through the salt filter.
  • the concept denoted filter here generally refers to an element through which a fluid passes, where the filter acts on the fluid.
  • the odour suppressing filter is constituted by a hygroscopic substance, and Zeolite too is hygroscopic, but Zeolite is here excluded from the concept of a hygroscopic substance.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Epidemiology (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The invention relates to an air filtration system comprising a fan or pump that pumps air through a sequence of filters, where the sequence of filters comprises an active carbon filter (AC, AC1- 2), and an odour suppressing filter (S). The odour suppressing filter (S) comprises a main active substance that acts on the air by suppressing odours, where the main substance is a hygroscopic substance. With such an odour suppressing filter (S) undesirable odours coming from the active carbon filter are suppressed or prevented. The odour suppressing filter (S) has as its main active substance a hygroscopic salt. The odour suppressing filter (S) may have as its main active substance one or several of sodium chloride, potassium chloride or magnesium chloride. In yet another embodiment, the filter sequence further comprises at least a Zeolite filter (Z), where the Zeolite filter (Z) is arranged after all the active carbon filters (AC, AC1-2) in the filter sequence. The Zeolite filter (Z) may also be arranged after the odour suppressing filter (S).

Description

Odour suppressing air filtration system
The present invention relates to an odour suppressing air filtration system according to the introductory portion of the independent claim.
Background of the invention
Active carbon filters are commonly used in air cleaning and in air cleaning using filters and, in particular in cleaning of air laden with cigarette smoke, the active carbon filters may tend to generate or let through undesirable odours. A means for effectively suppressing these odours is therefore required.
An object of the invention is therefore to provide an odour suppressing air filtration system which suppresses undesirable odours from the active carbon filters.
These and other objects are attained by an odour suppressing air filtration system according to the characterising portion of the independent claims.
Summary of the invention
The invention relates to an air filtration system comprising a fan or pump that pumps air through a sequence of filters, where the sequence of filters comprises at least one active carbon filter AC, AC 1 -2, and an odour suppressing filter S. The odour suppressing filter S comprises a main active substance that acts on the air by suppressing odours, where the main substance comprises a hygroscopic substance. With such an odour suppressing filter S undesirable odours coming from the active carbon filter are advantageously suppressed or prevented. The odour suppressing filter S has as its main active substance a hygroscopic salt. In advantageous embodiments, the odour suppressing filter S has as its main active substance one or several of sodium chloride, potassium chloride or magnesium chloride.
In yet another advantageous embodiment, the filter sequence further comprises at least a Zeolite filter Z, where the Zeolite filter Z is arranged after all the active carbon filters AC, AC 1-2 in the filter sequence. The invention further relates to such a filter sequence, where the Zeolite filter Z is arranged after the odour suppressing filter S.
Brief description of the drawings
Fig. 1 shows a first embodiment of a filter sequence with an odour suppressing filter according to the invention.
Fig. 2 shows a second embodiment of the filter sequence with an odour suppressing filter. Fig. 3 shows a third embodiment of the filter sequence with an odour suppressing filter. Description of preferred embodiments
The invention relates to an odour suppressing filter that constitutes one filter in a sequence of filters, used to clean contaminated air. The filter sequence if arranged in an air tight fashion in containment with an inlet and an outlet. The filter sequence is normally used in conjunction with a fan or a pump that makes air enter the inlet to the filter sequence, pass through the filters, and exit the filters through the outlet, as the arrows in the figures indicate. As the invention is directed towards the odour suppressing filter and the sequence of filters as such, the containment, the fan or any other necessary components are not depicted, and the figures just illustrates three general embodiments of the sequence of filter units that are denoted filter sequences which comprise an odour suppressing filter.
Fig. 1 shows a first embodiment of a filter sequence with an odour suppressing filter according to the invention, which comprises a sequence of three consecutive filters. The first filter S is constituted by an odour suppressing filter and its influence makes air passing through the filter sequence getting a significantly reduced undesirable odour. The odour suppressing filter S is generally constituted by a hygroscopic substance, and normally this hygroscopic substance is water soluble. More specifically, it comprises a hygroscopic salt, and a good example is filters based on table salt, NaCl. Actual table salt filter typically contains about 95% table salt, but in addition to this other substances are also added, such as ferrocyanide, anticaking agents and other. The first filter is followed by a second filter constituted by an active carbon filter AC. The active carbon filter is primarily intended to adsorb gaseous substances that constitute contaminations in the air that passes through the filter, but may also to some extent act as a mechanical filter that blocks particles in the air. When active carbon filters are used to clean air, in particular when they are used for cleaning cigarette smoke in air, the filter itself tends to generate gaseous substances that are not adsorbed by the filter, but passes through the filter and generates what to humans is experienced as undesirable odour. The purpose of the odour suppressing filter S is to prevent such odours.
After the active carbon filter AC follows a third filter M that is constituted by an ordinary mechanical filter, which is a filter that filters particles in the air that are too large to pass through the mechanical filter. In the selected embodiment, the mechanical filter is constituted by a filter of HEP A class HI 4, which for example is suitable for removing particles in air laden with particles from cigarette smoke.
Fig. 2 shows a second embodiment of the filter sequence with the odour suppressing air filter, which comprises five consecutive filter elements. The filter sequence starts in the same way as in the first embodiment, with an odour suppressing filter S, having the same function as in the first embodiment.
The second embodiment of the filter sequence comprises two different active carbon filters ACl, AC2. The odour suppressing filter S is followed by a second filter ACl that is constituted by a first CS active carbon filter, which is an active carbon filter produced from coconut shells. After that follows a third filter M constituted by a mechanical HEPA filter class HI 4. Then follows a fourth filter AC2 constituted by a second active carbon filter type GA. The two active carbon filters are intentionally selected to be of different kinds, as they preferentially adsorb different substances in such a way that the two filters complement each other.
The effect of the odour suppressing filter S is sufficient to suppress undesirable odours from both the active carbon filters.
The second active carbon filter AC2 is followed by a fifth and last filter constituted by a Zeolite filter Z. The Zeolite filter complements the adsorption in both the active carbon filters in a way corresponding to that in the second embodiment. Fig. 3 shows a third embodiment of the filter sequence comprising six consecutive filter elements. The order of the filter elements is different from that of the previous embodiments.
The first filter element in the third embodiment is constituted by a first mechanical filter Ml, acting as a prefilter. The second filter is a first active carbon filter AC1, followed by a third filter in the form of an odour suppressing filter S. The fourth filter is constituted by a second active carbon filter AC2 and the fifth filter is a Zeolite filter Z. The sixth and last filter is constituted by a second mechanical filter M2. The odour suppressing filter S, the active carbon filters AC1, AC2 and the Zeolite filter Z may emit small amounts of particles that come from the active filtering substance, so the second mechanical filter M2 acts as an end filter that removes any such particles.
The two mechanical filters Ml, M2 are preferably different, such that their actions complement each other. In the same fashion, the two active carbon filters are preferably of different kinds, such that their joint effect is better than if two identical filters had been used.
In the description, each filter element is denoted filter, but by this is not necessarily meant a unit that removes a contamination, and instead elements are conceivable that adds a substance to the air flowing through the filter element. An example is constituted by a hygroscopic salt filter. That absorbs moisture from the air passing through it until it has been saturated by water. If the humidity of the air passing through the salt filter falls, the salt will instead emit water vapour to the dry air passing through the salt filter. The concept denoted filter here generally refers to an element through which a fluid passes, where the filter acts on the fluid.
The odour suppressing filter is constituted by a hygroscopic substance, and Zeolite too is hygroscopic, but Zeolite is here excluded from the concept of a hygroscopic substance.

Claims

Claims
1 An air filtration system comprising a fan or pump that pumps air through a sequence of filters, where the sequence of filters comprises at least one active carbon filter (AC, AC 1-2), and an odour suppressing filter (S), characterised in that the odour suppressing filter (S) comprises a main active substance that acts on the air by suppressing odours, where the main substance comprises a hygroscopic substance.
2 An air filtration system according to claim 1 , characterised in that the odour suppressing filter (S) has as its main active substance a hygroscopic salt.
3 An air filtration system according to claim 2, characterised in that the odour suppressing filter (S) has as its main active substance one or several of sodium chloride, potassium chloride or magnesium chloride.
4 An air filtration system according to claim 3, characterised in that the odour suppressing filter (S) has as its main active substance sodium chloride
5 An air filtration system according to one of the preceding claims, characterised in that the main active substance in the odour suppressing filter (S) constitutes at least 70% by weight of the active substances in the filter. An air filtration system according to claim 5, characterised in that the main active substance in the odour suppressing filter (S) constitutes at least 80% by weight of the active substances in the filter. An air filtration system according to claim 5, characterised in that the main active substance in the odour suppressing filter (S) constitutes at least 90% by weight of the active substances in the filter. An air filtration system according to one of the preceding claims, characterised in that the filter sequence further comprises at least a Zeolite filter (Z), where the Zeolite filter (Z) is arranged after all the active carbon filters (AC, AC 1-2) in the filter sequence. An air filtration system according to claim 8, characterised in that the Zeolite filter (Z) is arranged after the odour suppressing filter (S).
PCT/SE2015/000033 2015-05-27 2015-05-27 Odour suppressing air filtration system WO2016190788A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE2015/000033 WO2016190788A1 (en) 2015-05-27 2015-05-27 Odour suppressing air filtration system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2015/000033 WO2016190788A1 (en) 2015-05-27 2015-05-27 Odour suppressing air filtration system

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112902351A (en) * 2021-01-12 2021-06-04 岚山环保科技（上海）有限公司 Air cleaner for smoking room convenient to wash
CN112902354A (en) * 2021-01-12 2021-06-04 岚山环保科技（上海）有限公司 Cigarette smoke purification device for smoking control room

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994014013A1 (en) * 1992-12-11 1994-06-23 Jaakko Raippalinna Filter system to purify air of smoking rooms
US20070083998A1 (en) * 2005-10-13 2007-04-19 Leskowicz James J Deodorizing compositions
WO2014114345A1 (en) * 2013-01-25 2014-07-31 Hauser Umwelt-Service Gmbh & Co. Kg Room air filter system
US20140260989A1 (en) * 2013-03-14 2014-09-18 Universal Laser Systems, Inc. Multi-stage air filtration systems and associated apparatuses and methods
SE1400258A1 (en) * 2014-05-21 2015-11-22 Qleanair Scandinavia Ab filter Series
SE1400257A1 (en) * 2014-05-21 2015-11-22 Qleanair Scandinavia Ab Fragrance suppressing air filter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994014013A1 (en) * 1992-12-11 1994-06-23 Jaakko Raippalinna Filter system to purify air of smoking rooms
US20070083998A1 (en) * 2005-10-13 2007-04-19 Leskowicz James J Deodorizing compositions
WO2014114345A1 (en) * 2013-01-25 2014-07-31 Hauser Umwelt-Service Gmbh & Co. Kg Room air filter system
US20140260989A1 (en) * 2013-03-14 2014-09-18 Universal Laser Systems, Inc. Multi-stage air filtration systems and associated apparatuses and methods
SE1400258A1 (en) * 2014-05-21 2015-11-22 Qleanair Scandinavia Ab filter Series
SE1400257A1 (en) * 2014-05-21 2015-11-22 Qleanair Scandinavia Ab Fragrance suppressing air filter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112902351A (en) * 2021-01-12 2021-06-04 岚山环保科技（上海）有限公司 Air cleaner for smoking room convenient to wash
CN112902354A (en) * 2021-01-12 2021-06-04 岚山环保科技（上海）有限公司 Cigarette smoke purification device for smoking control room

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