EP0372784A2 - Vorrichtung zur Versorgung einer Reinluftzone - Google Patents

Vorrichtung zur Versorgung einer Reinluftzone Download PDF

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Publication number
EP0372784A2
EP0372784A2 EP89312317A EP89312317A EP0372784A2 EP 0372784 A2 EP0372784 A2 EP 0372784A2 EP 89312317 A EP89312317 A EP 89312317A EP 89312317 A EP89312317 A EP 89312317A EP 0372784 A2 EP0372784 A2 EP 0372784A2
Authority
EP
European Patent Office
Prior art keywords
air
diffuser
diffuser means
central area
air flow
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP89312317A
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English (en)
French (fr)
Other versions
EP0372784B1 (de
EP0372784A3 (de
Inventor
Frederick Hugh Howorth
Nigel Hugh Howorth
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT89312317T priority Critical patent/ATE96218T1/de
Publication of EP0372784A2 publication Critical patent/EP0372784A2/de
Publication of EP0372784A3 publication Critical patent/EP0372784A3/de
Application granted granted Critical
Publication of EP0372784B1 publication Critical patent/EP0372784B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
    • F24F13/068—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser formed as perforated walls, ceilings or floors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
    • F24F3/163—Clean air work stations, i.e. selected areas within a space which filtered air is passed

Definitions

  • This invention relates to apparatus for providing a clean air zone, for example in surgical operating theatres, and in clean rooms for pharmaceutical production and packaging, as well as for micro-­electronics' production.
  • the effectiveness of the aforesaid type of graded flow diffusion system is dependant on three exacting conditions. Firstly, the temperature difference between the discharged air and the ambient air should not be more than ⁇ 2° C. Secondly, and as described in later U.K. Patent Specifications Nos: 1555563 and 1555564, there must be equally distributed air recirculation inlets located around the periphery of the graded discharge air diffuser in order to provide a negative velocity pressure equal to that of the positive velocity pressure of the discharged air.
  • the volume of climatic control air supplied into the graded airflow unit to mix with its recirculation air should not exceed 25% of the total volume, otherwise the negative velocity pressure created at the equally distributed air recirculation inlets is insufficient to induce the peripheral air outwards.
  • the rate, and thus the total volume, of air supplied may be increased.
  • this causes increased noise and, in operating theatres, also causes unacceptable drying of wounds, and wound cooling by increased evaporation, which in turn leads to hypothermia in patients.
  • a high air velocity is not acceptable.
  • apparatus for providing a clean air zone comprises supply means operative to supply clean air to a plenum chamber, and diffuser means, in the form of one or more perforated plates, arranged adjacent the chamber so that air supplied to the chamber flows out therethrough, characterised in that the diffuser means has a substantially planar central area and successive peripheral areas which are arranged at increasingly greater angles relative to the central area so that each increasingly deflects the air flow outwardly from the direction of air flow from the central area.
  • the aforesaid apparatus provides a pattern of air flow radiating outwards from the diffuser means.
  • Inlets distributed around the air discharge diffuser means, for recirculation of air, are no longer essential since the air flow pattern is now determined by the angle of the peripheral areas of the diffuser means rather than by the differential lower velocity of air from these areas.
  • the proportion of climatic control air introduced to the air supply means does not affect the air flow pattern and temperature differentials between air supplied by the apparatus and ambient air should have less influence than in the previously known arrangement.
  • deflector vanes are located between the successive peripheral areas of the diffuser means.
  • successive peripheral areas of the diffuser means may comprise separate perforated plates, each connected to a respective imperforate deflector vane.
  • the angle of each plate may be independently adjustable either upon installation, or subsequently.
  • the successive peripheral areas of the diffuser means and the intervening imperforate deflector vanes are provided as integral portions of respective profiled panels, which are arranged around the periphery of the central area of the diffuser means.
  • this construction is easier to install, as the relative angles of the perforated areas are fixed and do not have to be selected at the time of installation.
  • the relative angles may be chosen beforehand, from a small number of different profile configurations as those most favourable to the site.
  • Apparatus conforming to the invention is suitable for installation in the ceiling of an operating theatre to provide a clean air zone around a patient undergoing surgery, or in the ceiling of a pharmaceutical or electronic clean room to provide a clean air zone around a machine or manufacturing process, or in any other instance where minimal microbiological contamination is essential.
  • apparatus in accordance with the invention could be mounted in a mobile frame, upon a trolley, so that it can be moved from one location to another.
  • Air supply means in the form of electrically operated fans (not shown) are mounted so as to direct air through a plenum chamber 10 which is provided above the level of a false ceiling 12, and also immediately above an area which is to be kept substantially free of microbial or particulate contaminants, for example the area where an operating table is to be located in a surgical operating theatre.
  • air purifiers, heating means, cooling means and humidifiers may be provided to supply suitably conditioned, sufficiently clean air to the plenum chamber 10.
  • a terminal air filter 14 is also provided across the open lower side of the chamber 10, substantially level with the false ceiling 12.
  • diffuser means in the form of a plurality of perforated plates, designated generally by reference numeral 20, is mounted on the false ?eiling 12. These plates 20 effectively cover the open lower face of the plenum chamber 10 and constitute the outlet for air supplied to the chamber 10 by the fans.
  • the perforated plates comprise a large square, substantially planar central panel 21, arranged horizontally, aligned with or parallel to the ceiling 14, and a first group of narrow rectangular panels 22, which surround the central panel 21 and are disposed at an angle relative thereto, being inclined upwardly from the plane of the central panel 21 at an angle of about 20°.
  • a second group of rectangular panels 24 in turn surround the first group 22.
  • This second group 24 incline upwardly relative to the plane of the central panel 21 at a greater angle than the first group 22, for example, an angle of about 40° in the illustrated example.
  • a third group of rectangular panels 26 in turn surround the second group 24 and these incline upwardly from the plane of the central panel 21 at an angle of about 60°.
  • the panels 22, 24, 26 are all successively narrower and they are all perforated.
  • Each panel 22, 24, 26 is connected along its inner edge to a respective vane 23, 25, 27, which serves as an air deflector.
  • the panels 22, 24, 26 or their respective vanes 23, 25, 27 are mounted in pivotally adjustable manner whereby the angles of inclination of the respective diffuser panels 22, 24 and 26 and the proportion of air passing therethough can be adjusted
  • An additional deflector vane 29 is mounted at the outer edge of each outermost panel 26.
  • the fans operate to supply clean air through the plenum chamber 10 as indicated by the arrows A.
  • a suitable rate of air flow is 0.55m/sec.
  • the clean air passes into the room through the perforated diffuser panels 21, 22, 24, 26, issuing in each case in a direction perpendicular to the plane of the respective panel.
  • the air flows directly downwards through the large central panel 21, as indicated by the arrows B, but is deflected outwards, at increasing angles where it passes through the inclined panels 22, 24, 26 around the periphery of the diffuser arrangement, as indicated by the arrows C.
  • a gap remains between the outermost deflector vane 29 and the edge of the ceiling 12 defining the open lower face of the plenum chamber 10 and air flowing therethrough is so deflected by the plate 29 that it flows substantially horizontally immediately below the ceiling 12, as indicated by the arrow D.
  • an air flow pattern radiating outwards in all directions from the diffuser panel arrangement is achieved.
  • this air flow is of a suitable velocity, e.g. 0.55m/sec it will sweep down to the floor of the room and outwards, eventually dissipating via air outlets at the edges of the room, and via the door or doors.
  • Such air flow pattern is known to be advantageous in minimising aeromicrobiological contamination in the zone below the diffuser arrangement since unclean ambient air and contaminants introduced by operatives, including their natural emission of epithelial bacteria, are swept outwardly of that zone to maintain its sterility.
  • the advantage of the present apparatus is that this pattern is achieved more reliably than with previous apparatus which relies on differential air velocities.
  • FIG. 5 A second practical embodiment, which is shown in much greater detail in Figs. 2 to 11, is also ceiling mounted.
  • This apparatus is substantially rectangular, indeed square, in plan (Fig. 5) and comprises a housing 30 which includes four dependent side walls 31, 32, 33, 34.
  • Perforated diffuser means designated generally by reference numeral 40, are mounted within the side walls across the outflow passage from the apparatus.
  • the housing 30 is constructed from four modules, A, B, C, D as shown in Figs. 2 to 5, a single module being illustrated in greater detail in Fig. 6 to 10.
  • Each module has a metallic outer casing 35 consisting of an upper wall 36, adjacent side wall portions a b , and inner walls 37, 38, which are not as high as the side wall portions and which abut corresponding inner walls of the two adjacent modules when all four are assembled together.
  • the side wall portions a , b each have an air intake grille 39, so there are two in each side wall of the assembled apparatus.
  • air intake is not necessarily essential to the inventive concept, it is useful in practice because the apparatus is then self-contained so that at sites of installations where there are no suitable remote air vents already provided there is no need to undertake fresh construction of vents.
  • Prefilters 89 are mounted at the inside of the grilles to filter out major particulate contaminents.
  • the side wall portins a , b connect to narrow inturned lower walls 41, 42, which further connect to upturned auxiliary walls 43, 44.
  • the latter define an outer compartment to the apparatus.
  • a fan 45 is housed in this outer compartment.
  • Each fan 45 has an outlet duct 46 extending into the inner comparment of the apparatus which constitutes a plenum chamber P.
  • the fans 45 draw ambient air into the outer compartment through the grilles 39 (and optionally from a remote inlet as shown in Fig. 3) and supply it to the plenum chamber P.
  • Intermediate walls 47 are provided substantially parallel to the upper wall 36, across each corner region so as to direct the air from each fan 45 to the central region of the plenum chamber P.
  • each module casing are lined internally with sheets of sound attentuation material, conveniently in the form of foamed plastics material treated with fire retardant. Additional sound attentuation panels 48 are located in the outer compartment of each module. The purpose of all this sound attentuation material is, of course, to deaden the noise of operation of the fans 45.
  • each module At the corner of each module, between the inner walls 37, 38 (i.e. opposite the fan 45) the casing is formed with a part cylindrical recess 49.
  • these recesses 49 define a central opening through which a mounting shaft 50 of theatre lighting 51 extends (Figs. 2 to 4).
  • a high efficiency HEPA filter 52 is mounted across the plenum chamber, parallel with the upper wall 36 and between the auxiliary walls 43, 44 and inner walls 37, 38 of each module by means of respective fasteners 53. Below this the diffuser means 40 is mounted.
  • the diffuser means comprises a planar central area consisting of four substantially square perforate panels 60, one mounted to each housing module, and successive perforate peripheral areas, which are provided as respective regions of four elongate angled panels, 61 to 64, mounted along the four sides of the central area (i.e. extending between adjacent modules from corner to corner of the inner compartment).
  • the respective ends of the four panels 61 to 64 are cut obliquely, as for a mitre joint, and are mounted, with only a slight gap 83 remaining therebetween, at the corners (see Fig. 8).
  • Each large planar panel 60 is formed with an upturned rim 65 along adjacent edges which face the side wall portions a , b , of the relevant module, and with an upward and inwardly directed flange 66 along its other two edges which are aligned with the inner walls 37, 38 of the module (see Fig. 10).
  • Each panel 60 is suspended along one edge only from an inturned lower edge of an inner wall 37 by means of an elongate mounted strip 67, connected to the flange 66 and by means of pins 68. Its opposing edge is suspended by means of individual brackets 69, which can be released to allow the panel 60 to swing down, e.g. when access to the filter 52 is required.
  • the elongate peripheral panels 61 to 64 are corrugated, and their special angular profile is best seen in Figs. 7, 10 and 11. They include spaced, longitudinally extending perforated regions 71, 72, 73, the latter two of which lie in planes arranged angularly offset by 10° and 15° respectively from the plane of the region 71. Between the regions 71 and 72 and adjacent the region 73 there are longitudinally extending imperforate regions 74, 75, 76, which are disposed, in each case, at an oblique angle from adjacent perforate regions.
  • a hooked region 77 is formed at the inner edge margin of each panel 61 to 64, which, in use, engages over the rims 65 of two adjoining central panels 60.
  • a rubber gasket is fitted over the rims 65 to provide a more secure connection, without excessive play.
  • a substantially flat edge strip 78 which is bolted onto the underside of the lower walls 41 or 42 of adjoining housing modules, with a slight gap 79 remaining therebetween. The presence and width of this gap 79 is ensured by location of washers on the fixing bolts.
  • the central panels 60 and the peripheral panels 61 to 64 are mounted in position, as illustrated, the central panels 60 are substantially horizontal and the peripheral perforate region 71 is also substantially horizontal and the other two perforate regions 72, 73 are disposed, in this particular embodiment, respectively, at approximately 10° and 15° from the horizontal. Also in this particular embodiment, as best shown in Figs. 8 a and 11, the three perforate regions 71, 72 and 73 are provided respectively with three, five and five rows of elongate perforations.
  • the region 81 of each panel is perforated (see Figs. 8 and 8 a ). Disposed on an angle of 60° to the horizontal, between the region 81 for mounting the lamp 80 and the edge strip 78, is a further narrow region 82 provided with a single row of perforations.
  • the fans 45 draw ambient air in via the grilles 39 and the prefilters 89 (and optionally from one or more remote inlets, as shown in Fig. 3) and supply it centrally to the plenum chamber P. From there it passes via the HEPA filter 52, which should remove all remaining particulate contaminants, and out, as sterile air, via the respective perforations of the diffuser panels 60 to 64 and the predetermined gaps 83, 79, as shown by the various arrows in Fig. 11. The air flows vertically downwards from the central panels 60 and from the first perforated peripheral region 71.
  • the air passes out through the second perforated peripheral region 72 it is deflected outwardly by about 5°, and where it passes out through the third perforated peripheral region 73 by about 15°.
  • the intervening and adjacent imperforate regions 74, 75, 76 serve as deflector vanes, helping to guide the air outwards in the aforesaid pattern.
  • air passes out downwardly through the slight gaps 83 between the adjacent mitre cut edges of the peripheral panels 61 to 64, and additionally it passes outwardly at about 30° via the additional perforations beyond the ends of the lamps 80. In this way there is no tendancy for any influx of contaminated ambient at the corners of the area below the apparatus and the sterility of this zone is maintained.
  • the strip lights 80 are not essential and, the theatre lights 51 will of course only be appropriate where the apparatus is used in a hospital operating theatre.
  • the modular construction is also not essential, although useful, in practice, to facilitate manufacture and installation.
  • the precise configuration of and manner of attachment of the peripheral panels can vary in many ways as will be readily devised by designers in this technical field dependent on the air flow pattern most suitable to the site of installation.
  • the apparatus need not be ceiling mounted and could alternatively be mounted on a trolley, or on some other wall structure.
  • Intermediate constructions taking some features of the embodiment of Fig. 1, and some of the embodiment of Figs. 2 to 11 are also quite possible, i.e. some peripheral panels with more than one perforate region, and some completely perforate or with merely one such region, each panel being adjustable in its orientation.

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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)
  • Duct Arrangements (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP89312317A 1988-12-02 1989-11-28 Vorrichtung zur Versorgung einer Reinluftzone Expired - Lifetime EP0372784B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89312317T ATE96218T1 (de) 1988-12-02 1989-11-28 Vorrichtung zur versorgung einer reinluftzone.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888828127A GB8828127D0 (en) 1988-12-02 1988-12-02 Apparatus for providing clean air zone
GB8828127 1988-12-02

Publications (3)

Publication Number Publication Date
EP0372784A2 true EP0372784A2 (de) 1990-06-13
EP0372784A3 EP0372784A3 (de) 1991-01-02
EP0372784B1 EP0372784B1 (de) 1993-10-20

Family

ID=10647832

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89312317A Expired - Lifetime EP0372784B1 (de) 1988-12-02 1989-11-28 Vorrichtung zur Versorgung einer Reinluftzone

Country Status (7)

Country Link
EP (1) EP0372784B1 (de)
JP (1) JPH02187548A (de)
AT (1) ATE96218T1 (de)
AU (1) AU4558789A (de)
DE (1) DE68910091D1 (de)
GB (1) GB8828127D0 (de)
HU (1) HUT55900A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993001455A1 (en) * 1991-07-01 1993-01-21 ABB Fläkt Aktiebolag Method and means for the elimination of eddies in corners of rooms with laminar air flow and use of said means
WO1995016168A1 (en) * 1993-12-06 1995-06-15 Aet Arbeidsmiljø Og Energiteknikk A/S An arrangement relating to a ventilation installation mounted to a ceiling
AU688121B2 (en) * 1994-10-22 1998-03-05 Howorth Airtech Limited Clean air system
US20110294411A1 (en) * 2008-10-31 2011-12-01 Dan Kristensson Surgical Theatre Ventilating Devices and Methods
FR2979006A1 (fr) * 2011-08-08 2013-02-15 Aaf Sa Dispositif de soufflage notamment pour un bloc operatoire.
US8733060B2 (en) 2010-09-09 2014-05-27 Tate Access Floors Leasing, Inc. Directional grate access floor panel
US10058012B2 (en) 2010-12-17 2018-08-21 Tate Access Flooring Leasing, Inc. Multizone variable damper for use in an air passageway
ES2800398A1 (es) * 2020-05-06 2020-12-29 Metalfaber Slu Mampara modular para aislamiento de ambientes por presión positiva de flujo laminar

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5626588B2 (ja) * 2010-03-29 2014-11-19 清水建設株式会社 空調システム
JP5877721B2 (ja) * 2012-01-17 2016-03-08 大成建設株式会社 手術室空調システム
JP6481283B2 (ja) * 2014-08-19 2019-03-13 株式会社大林組 手術室
CN115200198B (zh) * 2021-04-14 2024-01-23 韦氏（苏州）医疗科技有限公司 组装式集中送风设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB601239A (en) * 1945-05-18 1948-04-30 Sturtevant Eng Co Ltd Improvements in or relating to air diffusers for ventilating and air conditioning plant
US3356006A (en) * 1965-10-18 1967-12-05 Robert D Scott Clean room structure
DE2013244A1 (de) * 1969-03-19 1970-10-01 Aktiebolaget Svenska Fläktfabriken, Nacka (Schweden) Luftversorgungsvorrichtung zur Injektion von vorzugsweise kalter Ventilationsluft
US3935803A (en) * 1972-10-12 1976-02-03 Flanders Filters, Inc. Air filtration apparatus
DE2836820A1 (de) * 1978-08-23 1980-03-06 Zinon Dr Med Duvlis Verfahren und einrichtung zur reinraumerzeugung
GB2120778A (en) * 1982-05-20 1983-12-07 Howorth Air Eng Ltd Outlet device for an air conditioning system
WO1986002711A1 (en) * 1984-11-01 1986-05-09 Total Air, Inc. Gaseous fluid distribution devices

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB601239A (en) * 1945-05-18 1948-04-30 Sturtevant Eng Co Ltd Improvements in or relating to air diffusers for ventilating and air conditioning plant
US3356006A (en) * 1965-10-18 1967-12-05 Robert D Scott Clean room structure
DE2013244A1 (de) * 1969-03-19 1970-10-01 Aktiebolaget Svenska Fläktfabriken, Nacka (Schweden) Luftversorgungsvorrichtung zur Injektion von vorzugsweise kalter Ventilationsluft
US3935803A (en) * 1972-10-12 1976-02-03 Flanders Filters, Inc. Air filtration apparatus
DE2836820A1 (de) * 1978-08-23 1980-03-06 Zinon Dr Med Duvlis Verfahren und einrichtung zur reinraumerzeugung
GB2120778A (en) * 1982-05-20 1983-12-07 Howorth Air Eng Ltd Outlet device for an air conditioning system
WO1986002711A1 (en) * 1984-11-01 1986-05-09 Total Air, Inc. Gaseous fluid distribution devices

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993001455A1 (en) * 1991-07-01 1993-01-21 ABB Fläkt Aktiebolag Method and means for the elimination of eddies in corners of rooms with laminar air flow and use of said means
WO1995016168A1 (en) * 1993-12-06 1995-06-15 Aet Arbeidsmiljø Og Energiteknikk A/S An arrangement relating to a ventilation installation mounted to a ceiling
AU688121B2 (en) * 1994-10-22 1998-03-05 Howorth Airtech Limited Clean air system
US20110294411A1 (en) * 2008-10-31 2011-12-01 Dan Kristensson Surgical Theatre Ventilating Devices and Methods
US8733060B2 (en) 2010-09-09 2014-05-27 Tate Access Floors Leasing, Inc. Directional grate access floor panel
US9326428B2 (en) 2010-09-09 2016-04-26 Tate Access Floors Leasing, Inc. Directional grate access floor panel
US9854711B2 (en) 2010-09-09 2017-12-26 Tate Access Floors Leasing, Inc. Directional grate access floor panel
US10058012B2 (en) 2010-12-17 2018-08-21 Tate Access Flooring Leasing, Inc. Multizone variable damper for use in an air passageway
FR2979006A1 (fr) * 2011-08-08 2013-02-15 Aaf Sa Dispositif de soufflage notamment pour un bloc operatoire.
ES2800398A1 (es) * 2020-05-06 2020-12-29 Metalfaber Slu Mampara modular para aislamiento de ambientes por presión positiva de flujo laminar
WO2021224518A1 (es) * 2020-05-06 2021-11-11 Metalfaber, S.L.U. Mampara modular para aislamiento de ambientes por presión positiva de flujo laminar

Also Published As

Publication number Publication date
EP0372784B1 (de) 1993-10-20
AU4558789A (en) 1990-06-07
HU896322D0 (en) 1990-02-28
HUT55900A (en) 1991-06-28
GB8828127D0 (en) 1989-01-05
DE68910091D1 (de) 1993-11-25
EP0372784A3 (de) 1991-01-02
ATE96218T1 (de) 1993-11-15
JPH02187548A (ja) 1990-07-23

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