US3380369A - System for ventilating clean rooms - Google Patents

System for ventilating clean rooms Download PDF

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Publication number
US3380369A
US3380369A US527686A US52768666A US3380369A US 3380369 A US3380369 A US 3380369A US 527686 A US527686 A US 527686A US 52768666 A US52768666 A US 52768666A US 3380369 A US3380369 A US 3380369A
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air
room
ceiling
clean rooms
curtain
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US527686A
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Allander Claes Gustaf
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/10—Parts, details or accessories
    • A61G13/108—Means providing sterile air at a surgical operation table or area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/10—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with air supply, or exhaust, through perforated wall, floor or ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/29—Air curtains

Definitions

  • a room requiring -a high purity of the air such as an operating room in a hospital is provided with a bounded space, for instance around the operating table, separated from the remainder of the room by an air curtain. Ventilated air of high purity is supplied to the bounded space through a perforated ceiling of said space, and the boundary air is supplied through a slot line encompassing said perforated ceiling. The air is exhausted through outlets near the floor of the room.
  • the object of this invention is to present a technical solution which renders possible the provision and maintenance of a pure zone in a room.
  • the invention is characterized by a curtain of iiowing air provided between an air slot and exhausing means and separating said zone from the remaining part of the room, and by means for supplying air within said separated zone.
  • FIG. 1 is a vertical sectional view of a room -having a pure zone in accordance with the invention
  • FIG. 2 is a top plan View of the room
  • FIG. 3 is a sectional view of a modified detail.
  • a zone of pure air is to be created above and around an operating-table 5 in a room having a ceiling 1, lioor 2 and walls 3 and 4.
  • a curtain 6 of air flow from slots 7 to exhausting means said slots and said exhausting means being disposed such that the air curtain separates a part 8 of the room from the remaining part of the room.
  • the slots 7 are provided in the ceiling and form outlets from a rectangular duct 9 located above the ceiling.
  • the duct 9 may be annular, polygonal or have any suitable shape encompassing a region of the ceiling.
  • the duct 9 receives air through a conduit 10.
  • the air exhausting means is disposed at the lower part of the room and is represented by a plurality of outlets 16 in the walls of the room near the lioor.
  • a pure zone can be maintained in the part 8 of the room without the necessity of air locks at the entrance or exit of the room. It is even possible to leave the doors of the room open.
  • the invention is not limited t0 the embodiment illustrated in the drawing.
  • the air slots 7 may be defined by adjustable guide members 17 (FIG. 3) which permit control of the direction of flow of the air from the slot.
  • the guide members are adjustable by means of control members 18 by means of which the guide members 17 can be turned about pivots 19.
  • the air slots may be provided in the lower part of the room and exhausting means may be provided in the ceiling.
  • the embodiment illustrated is more advantageous with respect to the introduction of additional air from the apertures 11.
  • a ventilated room having a ceiling and a iioor and ⁇ side walls extending between the ceiling and the lloor and encompassing the room, air supply slot means extending through and encompassing a region of said ceiling horizontally spaced from all said side walls, means for supplying air under positive pressure through said slot means and into the room, and exhaust means for air outlet adjacent said floor and encompassing at least a portion of the room thereby to induce the flow of a current of air from said slot means to said exhaust means with the curtain ot' air forming a continuous curtain enclosing on all lateral ⁇ sides a portion of space in the room and separating that space from the remainder of the room on all lateralsides.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Ventilation (AREA)
  • Air-Flow Control Members (AREA)
  • Duct Arrangements (AREA)

Description

Apri 3G, 1968 c. G. ALLANDER 3,380,359
SYSTEM FOR VENTILATING CLEAN ROOMS l Filed Feb. 15, 1966 1 1? u /14 9A f10 A IN V EN TOR. C; 4 is @as mf ,4L L ,4A/aff? United States Patent O 3,330,369 SYSTEM FOR VENTILATING CLEAN ROOMS Claes Gustaf Allander, Kometvagen 9, Taby, Sweden Filed Feb. 15, 1966, Ser. No. 527,686 Claims priority, application Sweden, Feb. 23, 1965, 2,308/ 65 3 Claims. (Cl. 9836) ABSTRACT GF THE DISCLOSURE A room requiring -a high purity of the air such as an operating room in a hospital is provided with a bounded space, for instance around the operating table, separated from the remainder of the room by an air curtain. Ventilated air of high purity is supplied to the bounded space through a perforated ceiling of said space, and the boundary air is supplied through a slot line encompassing said perforated ceiling. The air is exhausted through outlets near the floor of the room.
In rooms, for instance in hospitals, where high purity of the air has to be maintained, the amounts of ventilating air are very high if the air is to be sufficiently pure. Satisfactory removal of impurities requires a velocity of air of 0.7 to 1 foot per second in the room. At lower velocities there prevail uncontrollable conditions due to thermal disturbances- A velocity of the air of 0.7 to 1 foot per second usually corresponds t 200 to 400 changes of air per hour. For instance, in operating-rooms to changes per hour are usually obtained. Such rooms are ventilated in accordance with the thinning-out principle. It it absolu-tely necessary in such a room to prevent the entrance of impurities because an entering particle may statistically turn up anywhere in the room. At present these rooms are usually provided with air locks which are expensive. In many clean rooms, among others in operating-rooms in hospitals, high purity is required within part only of the room, for instance around the operating-table. If a zone of pure air can be maintained in this part of the room the requirements for large numbers of air changes as well as the need for air locks can be dispensed with. The object of this invention is to present a technical solution which renders possible the provision and maintenance of a pure zone in a room.
ln its broadest aspect the invention is characterized by a curtain of iiowing air provided between an air slot and exhausing means and separating said zone from the remaining part of the room, and by means for supplying air within said separated zone.
Additional features of -the invention will appear from the following description of an embodiment diagrammatically illustrated in the accompanying drawing. FIG. 1 is a vertical sectional view of a room -having a pure zone in accordance with the invention, FIG. 2 is a top plan View of the room, and FIG. 3 is a sectional view of a modified detail.
A zone of pure air is to be created above and around an operating-table 5 in a room having a ceiling 1, lioor 2 and walls 3 and 4. To this end there is provided a curtain 6 of air flow from slots 7 to exhausting means, said slots and said exhausting means being disposed such that the air curtain separates a part 8 of the room from the remaining part of the room. In the embodiment illustrated, the slots 7 are provided in the ceiling and form outlets from a rectangular duct 9 located above the ceiling. The duct 9 may be annular, polygonal or have any suitable shape encompassing a region of the ceiling. The duct 9 receives air through a conduit 10. Within the region of the ceiling confined by the duct 9 the ceiling is perforated so as to form a great num-ber of small air outlet apertures 11 in the bottom 12 of a box 14 which receives air through a conduit 15. The air exhausting means is disposed at the lower part of the room and is represented by a plurality of outlets 16 in the walls of the room near the lioor.
Into the jet curtain of primary air coming from the slots 7 there is drawn secondary air from the apertures 11 and from the part of the room that surrounds the jet curtain. If the amount of air supplied from said apertures 11 is less than half the total amount of secondary air which can be drawn in, the jet curtain arriving from the slots 7 will tend to contract itself with the result of insutiicient control of the pure zone within the cur-tain. For this reason the quantity of air supplied through the perforated ceiling should amount to at least that volume.
If the room is provided with a Ventilating system of the kind described a pure zone can be maintained in the part 8 of the room without the necessity of air locks at the entrance or exit of the room. It is even possible to leave the doors of the room open.
The invention is not limited t0 the embodiment illustrated in the drawing. The air slots 7 may be defined by adjustable guide members 17 (FIG. 3) which permit control of the direction of flow of the air from the slot. The guide members are adjustable by means of control members 18 by means of which the guide members 17 can be turned about pivots 19. The air slots may be provided in the lower part of the room and exhausting means may be provided in the ceiling. However, the embodiment illustrated is more advantageous with respect to the introduction of additional air from the apertures 11.
What I claim is:
1. A ventilated room having a ceiling and a iioor and `side walls extending between the ceiling and the lloor and encompassing the room, air supply slot means extending through and encompassing a region of said ceiling horizontally spaced from all said side walls, means for supplying air under positive pressure through said slot means and into the room, and exhaust means for air outlet adjacent said floor and encompassing at least a portion of the room thereby to induce the flow of a current of air from said slot means to said exhaust means with the curtain ot' air forming a continuous curtain enclosing on all lateral `sides a portion of space in the room and separating that space from the remainder of the room on all lateralsides.
2. A ventilated room as claimed in claim 1, said portion of the ceiling encompassed by said slot means having an area substantially less than the area of the ceiling which is outside said slot means.
3. A ventilated room as claimed in claim 1, the portion of said ceiling which is encompassed by said slot means being perforated, and means for supplying air to said perforated ceiling portion for induction into said curtain of air.
References Cited UNITED STATES PATENTS 3,150,584 9/1964 Allander 98-33 FOREIGN PATENTS 904,052 8/ 1962 Great Britain.
MEYER PERLIN, Primary Examiner.
US527686A 1965-02-23 1966-02-15 System for ventilating clean rooms Expired - Lifetime US3380369A (en)

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SE230865 1965-02-23

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BE (1) BE676849A (en)
DE (1) DE1604114B1 (en)
DK (1) DK112615B (en)
FI (1) FI43003B (en)
GB (1) GB1127793A (en)
NL (1) NL139594B (en)

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3462920A (en) * 1966-12-16 1969-08-26 Bell S Medical Products Ltd Gaseously formed curtains
US3511162A (en) * 1969-02-20 1970-05-12 Johnson & Johnson Apparatus and method for isolating a patient zone
US3515053A (en) * 1968-06-14 1970-06-02 Import Inspection Services Meat inspection system and method
US3602212A (en) * 1968-05-02 1971-08-31 Howorth & Co Ltd James Surgical operating theatre with sterile air admitting means
US3625133A (en) * 1969-01-13 1971-12-07 Sanko Air Plant Air-curtaining apparatus for forming an internal-isolated zone
US3626837A (en) * 1970-02-13 1971-12-14 Chs Ind Inc Dual plenum for ventilating ceilings in clean rooms
US3680557A (en) * 1970-05-06 1972-08-01 Becton Dickinson Co Controlled atmosphere incubator system with oxygen probe
US3726203A (en) * 1971-06-23 1973-04-10 Svenska Flaektfabriken Ab Device for maintenance of a dustfree, bacteria-free zone in a room
US3776217A (en) * 1969-12-18 1973-12-04 Pielkenrood Vinitex Bv Nursing box for babies or similar purposes
US3800686A (en) * 1972-03-28 1974-04-02 Tokyo Gas Co Ltd Air supply and exhaust duct system in a building
US3803995A (en) * 1970-09-04 1974-04-16 C Allander Arrangement for maintaining a ventilated zone within a part of a room partitioned by an air curtain
US3952640A (en) * 1973-03-01 1976-04-27 Vent-Cair, Inc. Apparatus and method for extracting grease and smoke, and method of installing the same
US3998142A (en) * 1975-07-03 1976-12-21 Sterilaire Medical, Inc. Air circulating system for ultra clean areas
US4009647A (en) * 1974-04-26 1977-03-01 Howorth Air Engineering Limited Clean air zone for surgical purposes
US4048912A (en) * 1974-09-19 1977-09-20 Ab Svenska Flaktfabriken Color spray booth and method of ventilating the same
US4063495A (en) * 1975-01-25 1977-12-20 Zinon Duvlis Contamination prevention for operating areas
US4094232A (en) * 1975-04-16 1978-06-13 Howorth Air Engineering Limited Clean air zone
US4133255A (en) * 1977-03-21 1979-01-09 Guice John J Paint spray booth and method of painting an article therein
US4137831A (en) * 1976-05-08 1979-02-06 Howorth Air Engineering Limited Clean air zone
US4140105A (en) * 1973-12-04 1979-02-20 Zinon Duvlis Gas curtain for shielding person on an operating table
US4606259A (en) * 1984-08-07 1986-08-19 Flakt Aktiebolag Air curtain
US4668484A (en) * 1984-02-13 1987-05-26 Elliott David J Transport containers for semiconductor wafers
DE3639708A1 (en) * 1986-11-20 1988-06-01 Metallbau Buedelsdorf Device for creating a clean room in the region of a clean field
US4927438A (en) * 1987-12-01 1990-05-22 Varian Associates, Inc. Horizontal laminar air flow work station
US5259812A (en) * 1992-09-23 1993-11-09 Kleinsek Don A Clean room and clean room containment center
US5457270A (en) * 1993-10-04 1995-10-10 Hildebrand; Philip B. Chemical control system for confining volatile liquids
US5792259A (en) * 1995-11-27 1998-08-11 Dainippon Screen Mfg. Co., Ltd. Substrate processing apparatus and air supply method in substrate processing apparatus
US6110244A (en) * 1994-10-22 2000-08-29 Howorth Airtech Limited Clean air system
US20040242955A1 (en) * 2003-03-26 2004-12-02 Jochim Koch Hoodless incubator
EP1495744A1 (en) * 2003-07-09 2005-01-12 van den Wildenberg, Pierre Installation for supplying clean air, power and other medical supplies to a surgical room
US20050250436A1 (en) * 2002-09-04 2005-11-10 Agne Nilsson System, device and method for ventilation
US20090156112A1 (en) * 2006-03-22 2009-06-18 Koken Ltd. Toxic gas exposure preventing system for anatomic practice room
US20120115409A1 (en) * 2009-04-24 2012-05-10 Ltb S.A. Smoking room with the air renewed by a laminar flow
JP2013085672A (en) * 2011-10-18 2013-05-13 Shimizu Corp Air conditioning system
US20150072609A1 (en) * 2012-03-29 2015-03-12 Howorth Air Technology Limited Clean air apparatus
US20160334120A1 (en) * 2015-05-12 2016-11-17 Halton Oy Controlled dilution flow in critical environments
WO2020070285A1 (en) * 2018-10-05 2020-04-09 Eir Clinical Ab Ventilation system for operating room
US20220333797A1 (en) * 2021-04-20 2022-10-20 FLOWGenuity Inc. System for creating a microenvironment within an ambient environment

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2222453B2 (en) * 1972-05-08 1981-09-24 Ltg Lufttechnische Gmbh, 7000 Stuttgart Slot air outlet for blowing supply air into a building room
DE2615904C3 (en) * 1976-04-10 1985-06-05 Weiss Technik GmbH Umwelt-Klima-Messtechnik, 6301 Reiskirchen Supply air ceiling for air conditioning of operating theaters and the like.
DE2911462C2 (en) * 1979-03-23 1981-12-03 Hansa Ventilatoren u. Maschinenbau Neumann GmbH & Co KG, 2915 Saterland Method and device for keeping the air clean in a fresh produce department
LU81292A1 (en) * 1979-05-18 1980-12-16 Eni Elect Nijverheidsinstall METHOD AND DEVICE FOR STERILIZING A GAS AND PROTECTING AN AREA OF A SPACE AGAINST THE PENETRATION OF CONTAMINANTS
DE3050685C2 (en) * 1980-02-05 1985-10-17 TTL Tür + Torschleier lufttechnische Geräte GmbH, 7065 Winterbach Device for generating an air curtain
FR2515319B1 (en) * 1981-10-26 1986-12-26 Air Ind VENTILATION AIR DISTRIBUTION WALL FOR WORK SPEAKERS
DE3242918A1 (en) * 1982-11-20 1984-05-30 Schulz u. Berger Blech- und Feineisenkonstruktionen GmbH, 6831 Reilingen Device for ventilating workplaces
NO934439D0 (en) * 1993-12-06 1993-12-06 Aet Arbeidsmiljoe Og Energitek Device at ceiling mounted ventilation system
NL2016881B1 (en) * 2016-06-02 2018-01-12 Medexs Holding B V METHOD AND DEVICE FOR AIRFLOW SETTING
WO2022039770A1 (en) * 2020-08-19 2022-02-24 Itt Manufacturing Enterprises Llc Air safety systems

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB904052A (en) * 1959-05-26 1962-08-22 Carrier Engineering Co Ltd Improvements relating to methods and apparatus for maintaining an atmosphere having predetermined characteristics in an open-fronted chamber
US3150584A (en) * 1961-09-04 1964-09-29 Svenska Flaektfabriken Ab Air-conditioning arrangement for operating rooms

Family Cites Families (2)

* Cited by examiner, † Cited by third party
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DE545632C (en) * 1928-03-07 1932-03-03 Karlrichard Mueller Dipl Ing Procedure for separating rooms
DE1095497B (en) * 1954-05-12 1960-12-22 Schilde Maschb Ag Air door for dryers and industrial ovens

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB904052A (en) * 1959-05-26 1962-08-22 Carrier Engineering Co Ltd Improvements relating to methods and apparatus for maintaining an atmosphere having predetermined characteristics in an open-fronted chamber
US3150584A (en) * 1961-09-04 1964-09-29 Svenska Flaektfabriken Ab Air-conditioning arrangement for operating rooms

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3462920A (en) * 1966-12-16 1969-08-26 Bell S Medical Products Ltd Gaseously formed curtains
US3602212A (en) * 1968-05-02 1971-08-31 Howorth & Co Ltd James Surgical operating theatre with sterile air admitting means
US3515053A (en) * 1968-06-14 1970-06-02 Import Inspection Services Meat inspection system and method
US3625133A (en) * 1969-01-13 1971-12-07 Sanko Air Plant Air-curtaining apparatus for forming an internal-isolated zone
US3511162A (en) * 1969-02-20 1970-05-12 Johnson & Johnson Apparatus and method for isolating a patient zone
FR2031559A1 (en) * 1969-02-20 1970-11-20 Johnson & Johnson
US3776217A (en) * 1969-12-18 1973-12-04 Pielkenrood Vinitex Bv Nursing box for babies or similar purposes
US3626837A (en) * 1970-02-13 1971-12-14 Chs Ind Inc Dual plenum for ventilating ceilings in clean rooms
US3680557A (en) * 1970-05-06 1972-08-01 Becton Dickinson Co Controlled atmosphere incubator system with oxygen probe
US3803995A (en) * 1970-09-04 1974-04-16 C Allander Arrangement for maintaining a ventilated zone within a part of a room partitioned by an air curtain
US3726203A (en) * 1971-06-23 1973-04-10 Svenska Flaektfabriken Ab Device for maintenance of a dustfree, bacteria-free zone in a room
US3800686A (en) * 1972-03-28 1974-04-02 Tokyo Gas Co Ltd Air supply and exhaust duct system in a building
US3952640A (en) * 1973-03-01 1976-04-27 Vent-Cair, Inc. Apparatus and method for extracting grease and smoke, and method of installing the same
US4140105A (en) * 1973-12-04 1979-02-20 Zinon Duvlis Gas curtain for shielding person on an operating table
US4009647A (en) * 1974-04-26 1977-03-01 Howorth Air Engineering Limited Clean air zone for surgical purposes
US4048912A (en) * 1974-09-19 1977-09-20 Ab Svenska Flaktfabriken Color spray booth and method of ventilating the same
US4063495A (en) * 1975-01-25 1977-12-20 Zinon Duvlis Contamination prevention for operating areas
US4094232A (en) * 1975-04-16 1978-06-13 Howorth Air Engineering Limited Clean air zone
US3998142A (en) * 1975-07-03 1976-12-21 Sterilaire Medical, Inc. Air circulating system for ultra clean areas
US4137831A (en) * 1976-05-08 1979-02-06 Howorth Air Engineering Limited Clean air zone
US4133255A (en) * 1977-03-21 1979-01-09 Guice John J Paint spray booth and method of painting an article therein
US4668484A (en) * 1984-02-13 1987-05-26 Elliott David J Transport containers for semiconductor wafers
US4606259A (en) * 1984-08-07 1986-08-19 Flakt Aktiebolag Air curtain
DE3639708A1 (en) * 1986-11-20 1988-06-01 Metallbau Buedelsdorf Device for creating a clean room in the region of a clean field
US4927438A (en) * 1987-12-01 1990-05-22 Varian Associates, Inc. Horizontal laminar air flow work station
US5259812A (en) * 1992-09-23 1993-11-09 Kleinsek Don A Clean room and clean room containment center
US5457270A (en) * 1993-10-04 1995-10-10 Hildebrand; Philip B. Chemical control system for confining volatile liquids
US6110244A (en) * 1994-10-22 2000-08-29 Howorth Airtech Limited Clean air system
US5792259A (en) * 1995-11-27 1998-08-11 Dainippon Screen Mfg. Co., Ltd. Substrate processing apparatus and air supply method in substrate processing apparatus
US20050250436A1 (en) * 2002-09-04 2005-11-10 Agne Nilsson System, device and method for ventilation
US7361082B2 (en) * 2002-09-04 2008-04-22 Johnson Medical Development Pte. Ltd. System, device and method for ventilating a room
EP1539080B1 (en) * 2002-09-04 2012-03-28 Johnson Medical Development Pte Ltd System, device and method for ventilation
US6926664B2 (en) * 2003-03-26 2005-08-09 Dräger Medical AG & Co. KGaA Hoodless incubator
US20040242955A1 (en) * 2003-03-26 2004-12-02 Jochim Koch Hoodless incubator
EP1495744A1 (en) * 2003-07-09 2005-01-12 van den Wildenberg, Pierre Installation for supplying clean air, power and other medical supplies to a surgical room
US20090156112A1 (en) * 2006-03-22 2009-06-18 Koken Ltd. Toxic gas exposure preventing system for anatomic practice room
US20120115409A1 (en) * 2009-04-24 2012-05-10 Ltb S.A. Smoking room with the air renewed by a laminar flow
JP2013085672A (en) * 2011-10-18 2013-05-13 Shimizu Corp Air conditioning system
US20150072609A1 (en) * 2012-03-29 2015-03-12 Howorth Air Technology Limited Clean air apparatus
US10962246B2 (en) * 2012-03-29 2021-03-30 Howorth Air Technology Limited Clean air apparatus and method for discharging clean air towards a target clean area in the form of an air curtain
US20160334120A1 (en) * 2015-05-12 2016-11-17 Halton Oy Controlled dilution flow in critical environments
US10852015B2 (en) * 2015-05-12 2020-12-01 Halton Oy Controlled dilution flow in critical environments
WO2020070285A1 (en) * 2018-10-05 2020-04-09 Eir Clinical Ab Ventilation system for operating room
US20220333797A1 (en) * 2021-04-20 2022-10-20 FLOWGenuity Inc. System for creating a microenvironment within an ambient environment

Also Published As

Publication number Publication date
GB1127793A (en) 1968-09-18
DE1604114B1 (en) 1971-12-23
FI43003B (en) 1970-09-02
BE676849A (en) 1966-07-18
NL6602354A (en) 1966-08-24
DK112615B (en) 1968-12-30
NL139594B (en) 1973-08-15

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