EP0511736A2 - Système de ventilation - Google Patents

Système de ventilation Download PDF

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Publication number
EP0511736A2
EP0511736A2 EP92302593A EP92302593A EP0511736A2 EP 0511736 A2 EP0511736 A2 EP 0511736A2 EP 92302593 A EP92302593 A EP 92302593A EP 92302593 A EP92302593 A EP 92302593A EP 0511736 A2 EP0511736 A2 EP 0511736A2
Authority
EP
European Patent Office
Prior art keywords
air
duct
floor
carpet
feeder
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.)
Withdrawn
Application number
EP92302593A
Other languages
German (de)
English (en)
Other versions
EP0511736A3 (en
Inventor
John O. Lephardt
Ronald A. Tamol
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philip Morris Products Inc
Philip Morris USA Inc
Original Assignee
Philip Morris Products Inc
Philip Morris USA Inc
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 Philip Morris Products Inc, Philip Morris USA Inc filed Critical Philip Morris Products Inc
Publication of EP0511736A2 publication Critical patent/EP0511736A2/fr
Publication of EP0511736A3 publication Critical patent/EP0511736A3/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • F24F2013/0608—Perforated ducts

Definitions

  • the present invention relates generally to an air ventilation system for ventilating, heating, cooling or purifying areas such as rooms, houses, theaters, offices or any partitioned spaces and more particularly to an air ventilation system comprising an air permeable carpet material placed over perforated flooring that is supported by a below-floor air distribution system, and further comprising an in-ceiling air exhaust vent system.
  • vents have a square or rectangular footprint and a minimal depth. Their footprints typically are between two and ten square feet.
  • Illustrative examples include long side-wall diffusers and vertical pole diffusers.
  • each of the vents used in typical ventilation schemes may be used either for blowing air into the enclosed area or for exhausting air, or both.
  • a house or office suite has one or more ceiling vents through which air that is blown through ducts enters the space to be ventilated.
  • the exhaust air may be filtered or purified with an electrostatic precipitator (of the types widely used) or with a foam, glass fiber or carbon filter (also widely used) and then recirculated. More commonly, all or a portion of the exhaust air is recirculated without being purified.
  • Drafts are another disadvantage of the known ventilation schemes. High velocity air that is blown out of vents results in drafts that can be detected by people. Such detectable drafts typically occur when the air velocity is over 9-12m/minute (30-40 feet/minute). If a space requires a given amount of ventilation, then the velocity of the air blown into the space must increase as the surface area of the vents used decreases. In a typical system, drafts can be felt by people located near the vents. Such drafts are undesirable because they can be uncomfortable for people exposed to the drafts and they may disturb papers or other items that are exposed or loose. The drafts also are frequently associated with perceptible noise due to high velocity of the air moving through the vents.
  • Drafts are more likely to occur when an area is subjected to high density use or high thermal loads.
  • High density use and high thermal loading occur when an area is occupied by a large number of people (for example, over one person per ten square feet is a high density use).
  • High density use and high thermal loading also occur when machinery that requires cooling or air exchange is used in an area being ventilated. Drafts are likely to occur in areas subject to high density use loading because in order to keep the air fresh (i.e., free of atmospheric contaminants such as carbon dioxide and particulate matter) a relatively large amount of fresh air or purified air must be delivered into the area.
  • drafts are likely to occur in areas subject to high thermal loading because in order to maintain a comfortable air temperature, a relatively large amount of fresh or purified air at a subambient temperature must be delivered into the area.
  • Partitioned office space generally comprises a space that is subdivided by barriers known as partitions, which typically are between four and six feet high. The partitions do not contact the ceiling.
  • Each of the subdivided areas typically is used as an office for one or more persons.
  • cubicles near a vent will receive a better ventilation than cubicles far from a vent.
  • One solution to providing ventilation to distant cubicles is to increase the velocity of air blown through the vents so that distant cubicles receive adequate ventilation.
  • the increased air velocity may be perceived as an undesirable draft in cubicles near to the vent.
  • papers may be disturbed by the resulting drafts.
  • Mixing of odorants also is a problem with ventilating partitioned areas.
  • French Patent No. 698.707 discloses a system for distribution of air in a room using large porous or perforated parts of the floor as a diffusion surface.
  • the floor is formed of a lining of metal wires that are wound helically and interlaced with each other and are reinforced by rods. This lining is covered with a permeable carpet. The air is blown into and circulates within the spaces kept free by the coils of metal wires. The air enters the room being ventilated by diffusing through the carpet.
  • French Patent No. 828.779 discloses a perforated floor that is covered by a covering, which may be formed of a material with closely spaced slits and orifices through which the air diffuses.
  • a perforated computer floor ventilation system is offered commercially by Goldbach GMBH (Bruhofstrasse 5C, P.O. Box 1240, Goldbach, Germany) as the Type L600x600 Access Floor System.
  • Goldbach GMBH Goldbach GMBH
  • Bahnhofstrasse 5C P.O. Box 1240, Goldbach, Germany
  • the perforations in that system extend through both the carpet material and the floor support material, thus making the carpet material aesthetically unattractive.
  • the present invention provides an air ventilation system that employs: (a) a perforated floor that is supported on a plurality of floor joists; (b) an air permeable carpet, which is not perforated, that is placed on top of the perforated floor; (c) at least one air exhaust vent that is located at or near the ceiling of the area being ventilated; (d) a duct means for conducting the exhaust air from the exhaust vent(s) to a pumping means; and (e) a second duct means for transporting air from the pumping means to the space being ventilated, which introduces air into both ends of channels formed by the floor joists.
  • drafts that occur in areas having conventional ventilation systems, especially in areas having high density uses are substantially eliminated.
  • mixing is also reduced and partitioned spaces are adequately ventilated.
  • the perforated floor/permeable carpet displacement air ventilation system of the present invention also comprises: an apparatus for purifying or screening the exhaust air; an apparatus for drawing in fresh air from the atmosphere outside the space being ventilated; an apparatus for conducting exhaust air to the atmosphere outside the space being ventilated; and an apparatus for mixing exhaust air and fresh air.
  • air is introduced in a room or other area at the floor level and is removed at, or near, the ceiling level.
  • This offers advantages in air quality and occupant comfort over conventional mixed air systems. The advantages arise because air contaminants and impurities are carried upwards with minimal mixing through the zone occupied by people in the room. This zone is called the "breathing zone” or the “occupied zone”. Heat generated by the occupants is also displaced upwards to the ceiling. Thus a comfortable condition can be maintained in the occupied zone.
  • the perforated floor/permeable carpet system of the present invention can be used for ventilating any type of space, including offices, houses, theaters, conference rooms, designated smoking areas, buses, passenger railway cars, and airplanes. Partitions may be supported on top of the air pormeable carpet to divide the ventilated area into convenient work areas.
  • an area 5 having two side walls 10, 20, front and rear walls (not shown in FIG. 1), a ceiling 30 and a floor 40 is ventilated, heated or cooled by means of the perforated floor/permeable carpet ventilating system of the present invention.
  • the floor 40 comprises a perforated plate 50 and a carpet 60 that is permeable to air.
  • the plate 50 is supported by a plurality of elongated roughly parallel floor joists 70.
  • the plate 50 is placed on the top side of the floor joists 70.
  • the bottom side of each floor joist 70 is on a surface 80 (hereafter "ground") that is relatively impermeable to air, such as the ground, a concrete foundation, or the ceiling of a lower floor in a multi-floor structure.
  • Two exhaust vents 90 are shown.
  • the perforated plate 50 can be made of any material, such as wood (with holes or slits) or, preferably, perforated steel sheet.
  • the plate 50 must be strong enough to support a load comprising people, furniture, machinery or other objects that may occupy the area 5 to be ventilated. It is preferable to maximize the density of perforations. However, since perforations tend to decrease the strength of the plate, the density of perforations is constrained by the expected load and the strength of the material used.
  • each of the perforations is sufficiently small such that pointed objects that typically contact floors, such as a pointed or spiked shoe heels, will not enter the perforations by mistake.
  • Carpet 60 can be made of any material which is relatively permeable to air.
  • the carpet 60 is sufficiently permeable so as to permit an air flow rate of at least 3 m/minute (10 feet/minute) without any noticeable lifting or buckling.
  • Typical commercial carpets are not adequate because they generally incorporate relatively impermeable backing materials, such as adhesives or other film forming agents, or the strands of the carpet are too tightly packed or woven.
  • one suitable carpet is Design VI carpet, made by Lees Carpet, which has been modified by incorporating a latex backing with a reduced filler and a reduced film forming agent, rather than the relatively impermeable backing that generally is used. Using this modified backing makes the carpet sufficiently permeable because the tiny openings which naturally occur in the carpet when it is manufactured are not blocked.
  • the carpet 60 may be installed on the perforated plate 50 in any manner which will not significantly impair the carpet's permeability and will sufficiently anchor the carpet such that it will not become detached under normal use and will not bow or buckle.
  • One means of installing the carpet 60 is to attach it to the plate 50 with tack strips.
  • Another installation means is to glue the carpet 60 to the plate 50 with 50 mm (two inch) wide strip of glue along its perimeter.
  • more than one exhaust vent 60 is used. Mixing is reduced by uniformly distributing the exhaust vents 60 throughout the ceiling area, rather than placing the vents at or near the walls. If only one exhaust vent 60 is used, it would be preferable to locate it at the center of the ceiling so as to minimize mixing.
  • the floor 40 and floor joists 70 arrangement is shown in detail in FIGS. 2 and 3.
  • the floor joists 70 are preferably spaced in roughly parallel alignment with each other and runs between front wall 100 and rear wall 110.
  • the spaces between floor joists are channels 120 which extend unimpeded from the area of the front wall 100 to the area of the rear wall 110.
  • the floor joists 70 be roughly parallel to each other, other arrangements are possible. For example, some of the floor joists may contact each other to provide additional support for the floor 40 but still allow air to flow in the channels.
  • the floor joists be oriented with respect to each other such that they form unobstructed channels, which can be used for air distribution. In some areas to be ventilated, as few as two floor joists, forming just one air distribution channel, may be used.
  • Typical floor joists have a rectangular or "I"-shaped cross section and are made of wood or steel.
  • the floor joists 70 should be constructed such that are strong enough to support a load comprising people, furniture, machinery or other objects that may occupy the area 5 to be ventilated without sagging.
  • ends of the floor joists do not contact either the front wall 100 or the rear wall 110, thus forming two feeder ducts 130, 140.
  • the front feeder duct 130 runs parallel to the front wall 100 between the front wall 100 and the front ends of the floor joists 70.
  • Rear feeder duct 140 runs parallel to the rear wall 110 between the rear wall 110 and the rear ends of the floor joists 70.
  • the air flow rates through the feeder ducts can be varied in accordance with the flow rate desired through the permeable carpet 60. Generally it will be desirable to maintain approximately the same air flow rates in each of the feeder ducts in order to promote a uniform air velocity distribution through the permeable carpet 60. However, other desirable air velocity distributions may be achieved by using different air flow rates in the feeder ducts.
  • the floor joists 70 run all the way from the front to the rear walls 100, 110 and the front and rear ends of the floor joists contact the walls.
  • Front and rear feeder ducts 143, 145 are formed in this embodiment by two ducts, one that runs the entire length of the front wall 100, at a level below the floor 40 and above the ground 80 and the second that runs the entire length of the rear wall 110, also at a level below the floor 40 and above the ground 80.
  • air is conducted through ducts 280,290 to the front and rear feeder ducts 130, 140. Air then enters the channels 120 from both the front and rear ends of the channels through front and rear feeder ducts 130, 140. Because of a pressure differential between the channels 120 and the area 5 above the floor 40, air diffuses from the channels 120 through the perforated floor 50 and the permeable carpet 60. It has been found that a pressure differential that can achieve a desirable air velocity through the floor 40 of 3 m/minute (10 feet/minute) is about 0.63 mm (0.025 inches) of water, in a system using the modified Lees carpet described above. Other pressure differentials may be used, but generally the best results are achieved in the range of from about 0.3 mm (0.01 inches) of water to about 6.3 mm (0.25 inches) of water.
  • FIGS. 6-8 show the air velocity distribution in a system having no carpet and only one feeder duct. The air flows in from the left hand side). As shown, the velocity through the perforated floor closest to the feeder duct is low in comparison to the velocity at the far wall (at right).
  • FIG. 7 shows the air velocity distribution in a system having no carpet and two feeder ducts (one on the right side and one on the left side). The air velocity in this case is higher in the middle than at the edges.
  • FIG. 8 shows that if a permeable carpet, and front and rear feeder ducts are used, as in the present invention, then the air velocity approximately is the same at the edges as in the interior. This flat velocity distribution helps eliminate drafts and mixing.
  • the ventilation system of the present invention optionally may include either an electrostatic precipitator 200 or a carbon filter 210, or both. It also may include other air filtering or purifying apparatus, as well as air heating and cooling systems. Air is exhausted from the ventilated area 5 through any of the exhaust vents 90 and into exhaust duct 220. The exhaust air optionally may be completely or partially exhausted to the atmosphere either through exhaust duct 230 or exhaust duct 240 or both. A shunt or valve-type apparatus 245 is used to control the amount of air that is vented to the atmosphere. Exhaust duct 240 is positioned after the air purifying apparatus such as the carbon filter 200 and the electrostatic precipitator 210.
  • duct 230 The energy use and wear and tear on machinery can be reduced if duct 230 is used instead because the exhaust air that is not recirculated is not subjected to purification.
  • Air is taken in from the atmosphere through intake duct 250 and a shunt or valve-type apparatus 255 is used to control the amount of fresh air that is drawn in.
  • a pumping means 260 such as a fan or compressor, propels air in the conventional fashion into duct 270.
  • Duct 270 branches into two ducts 280, 290 which lead to the feeder ducts 130, 140.
  • pumps or fans may be included in the system in other locations, as needed.
  • ducts, pumping means and purification apparatus may be used, as long as air is circulated out of the exhaust vent 90 and into the feeder ducts 130, 140.
  • the purification apparatus may be eliminated and all the exhaust air may be vented through duct 230. In such a system, all the air conducted to the feeder ducts 130, 140 would be fresh air.
  • two pumps may be used, one placed to feed air into the front feeder duct 130 and the other placed to feed air into the rear feeder duct 140.
  • a portion of the exhaust air is vented to the atmosphere and the remainder is mixed with fresh air from the atmosphere and then fed into the feeder ducts 130, 140.
  • control system may be incorporated to control the air flow rates, intake rates and exhaust rates throughout the system.
  • the carbon filter 200 may be of the known type, such as the Model 3CF Glide Pack sold by Farr Air Filter Company.
  • Various carbon filter media may be used such as acid impregnated carbon.
  • Such carbon filters may remove gaseous materials, such as ammonia and nicotine, from the exhaust air and can be 80%, or more, efficient in removing those materials.
  • the electrostatic precipitator 210 also may be constructed of known components.
  • the electrostatic precipitator 210 removes particulate matter, such as dust and smoke particles, from the exhaust air.
  • a typical electrostatic precipitator can be 80%, or more, efficient in removing these materials.
  • Other air purification apparatus that optionally may be used include glass fiber filters and high efficiency particulate (“HEPA”) filters and temperature and humidity controls.
  • HEPA high efficiency particulate
  • the following example illustrates a ventilating system having the components of the present invention.
  • a room was ventilated as follows.
  • the room was fourteen feet long, fourteen feet wide and ten feet, nine inches high.
  • the perforated plate was made of steel having round punched holes averaging 6.3mm (0.25 inches) in diameter. Open area occupied 23% of the area enclosed by the perimeter of the plate.
  • the permeable carpet was the modified Lees carpet discussed above.
  • Ten exhaust vents were built into the ceiling. Each exhaust vent had a square footprint covering one square foot.
  • An electrostatic precipitator, a carbon filter and temperature control mechanism were incorporated in the ventilating system.
  • Air was introduced into the room at a rate of 50 m3/minute (1800 cubic fee/minute) and an average carpet face velocity of about 3 m/minute (10 feet/minute).
  • the air introduced into the room was comprised of a mixture of 50% fresh air and 50% recirculated room air that was purified by being passed through an electrostatic precipitator and a carbon filter.
  • the controlled air temperature was set at 23°C (73°F) and the relative humidity was set at 50%.
  • Twenty-four cigarettes were continuously statically burned -- sitting in ash trays. The static burning was begun one-half hour before the start of measurements in order to achieve an equilibrium within the room.
  • the heat generated by a room full of people was simulated by lighting sixteen 100-watt light bulbs at a height of about four feet from the ground.
  • Air particulate levels were measured at several locations on the floor of the room and, for each location, at three different heights in relation to the floor (at floor level, about five feet above the floor and about eight and one-half feet above the floor).
  • the air particulate level of the air exiting the room at the exhaust vents also was 0.4 mg/m3.
  • mg/m3 milligrams/cubic meter
  • the measured air particulate levels were significantly lower: 0.05 mg/m3 at floor level, 0.06 mg/m3 at a height of 5 feet above floor level and 0.28 mg/m3 at a height of 8.5 feet above floor level. There was little mixing at the floor level and 1.5 m (5 feet) above the floor. At a height of 2.6 m (8.5 feet) above the floor, there was some mixing, but less than would be expected in a room with a conventional ventilating system.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Duct Arrangements (AREA)
  • Floor Finish (AREA)
  • Central Air Conditioning (AREA)
EP19920302593 1991-04-30 1992-03-25 Air ventilation system Withdrawn EP0511736A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69365691A 1991-04-30 1991-04-30
US693656 1991-04-30

Publications (2)

Publication Number Publication Date
EP0511736A2 true EP0511736A2 (fr) 1992-11-04
EP0511736A3 EP0511736A3 (en) 1993-07-07

Family

ID=24785563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920302593 Withdrawn EP0511736A3 (en) 1991-04-30 1992-03-25 Air ventilation system

Country Status (5)

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EP (1) EP0511736A3 (fr)
JP (1) JPH05164395A (fr)
KR (1) KR920020146A (fr)
AU (1) AU1527092A (fr)
CA (1) CA2067575A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996026395A1 (fr) * 1995-02-24 1996-08-29 Christiansen, John Dispositif de conditionnement de l'air localise, economique et salubre
WO1997027434A1 (fr) * 1996-01-24 1997-07-31 Chemfab Corporation Diffuseur d'air en tissu
US6059655A (en) * 1996-01-24 2000-05-09 Chemfab Corporation Fabric air diffuser, method for diffusing air, and method for attenuating noise associated with flowing air
WO2018111107A1 (fr) * 2016-12-16 2018-06-21 Lauka Holding B.V. Bâtiment pour garder des marchandises à ventiler, ainsi que partie de plancher à utiliser dans le bâtiment
WO2021242107A1 (fr) * 2020-05-29 2021-12-02 Goflow B.V. Système de ventilation
NL2025707B1 (en) * 2020-05-29 2022-01-13 Goflow Tech Ip B V Ventilation system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI469729B (zh) * 2010-08-25 2015-01-11 Hon Hai Prec Ind Co Ltd 貨櫃數據中心及其散熱控制系統
CN102375515A (zh) * 2010-08-27 2012-03-14 鸿富锦精密工业（深圳）有限公司 货柜数据中心及其散热控制系统
CN107120751B (zh) * 2017-05-05 2022-10-14 杭州卡丽智能科技股份有限公司 一种适于多住户楼宇的智能空气净化系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR698707A (fr) * 1929-10-10 1931-02-03 Système d'aération pour le renouvellement de l'atmosphère d'un local quelconque
FR828779A (fr) * 1937-02-01 1938-05-30 Procédé et dispositifs de conditionnement d'air
FR2217640A1 (fr) * 1973-02-15 1974-09-06 Sulzer Ag
US3835758A (en) * 1973-09-13 1974-09-17 J Bean Dwelling space air condition control and air change control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR698707A (fr) * 1929-10-10 1931-02-03 Système d'aération pour le renouvellement de l'atmosphère d'un local quelconque
FR828779A (fr) * 1937-02-01 1938-05-30 Procédé et dispositifs de conditionnement d'air
FR2217640A1 (fr) * 1973-02-15 1974-09-06 Sulzer Ag
US3835758A (en) * 1973-09-13 1974-09-17 J Bean Dwelling space air condition control and air change control system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996026395A1 (fr) * 1995-02-24 1996-08-29 Christiansen, John Dispositif de conditionnement de l'air localise, economique et salubre
WO1997027434A1 (fr) * 1996-01-24 1997-07-31 Chemfab Corporation Diffuseur d'air en tissu
US5725427A (en) * 1996-01-24 1998-03-10 Chemfab Corporation Fabric air diffuser, method for diffusing air, and method for attenuating noise associated with flowing air
US6059655A (en) * 1996-01-24 2000-05-09 Chemfab Corporation Fabric air diffuser, method for diffusing air, and method for attenuating noise associated with flowing air
WO2018111107A1 (fr) * 2016-12-16 2018-06-21 Lauka Holding B.V. Bâtiment pour garder des marchandises à ventiler, ainsi que partie de plancher à utiliser dans le bâtiment
NL2018016B1 (nl) * 2016-12-16 2018-06-26 Bouwbedrijf Rovers B V Gebouw, samenstelling en vloerdeel
WO2021242107A1 (fr) * 2020-05-29 2021-12-02 Goflow B.V. Système de ventilation
NL2025707B1 (en) * 2020-05-29 2022-01-13 Goflow Tech Ip B V Ventilation system

Also Published As

Publication number Publication date
JPH05164395A (ja) 1993-06-29
KR920020146A (ko) 1992-11-20
AU1527092A (en) 1992-11-05
EP0511736A3 (en) 1993-07-07
CA2067575A1 (fr) 1992-10-31

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