US983877A - Air-screen. - Google Patents
Air-screen. Download PDFInfo
- Publication number
- US983877A US983877A US54147510A US1910541475A US983877A US 983877 A US983877 A US 983877A US 54147510 A US54147510 A US 54147510A US 1910541475 A US1910541475 A US 1910541475A US 983877 A US983877 A US 983877A
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- US
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- Prior art keywords
- air
- doorway
- sheet
- adjacent
- maintaining
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- 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.)
- Expired - Lifetime
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-
- 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
Definitions
- My present invention has for its object the provision of means for preventing the wind
- I preferably provide exhaust means in the floor for sucking the air downward from the door opening and thence forcing the air around to the top of the opening and downward, so that a forced draft in the form of a thin sheet or veil of air is continually flowing from the top downward to the bottom across the entire door opening.
- I provide a vestibule containing means for a plurality of these wind barriers and means-for bending or diverting the veil from a strictly vertical plane so that thereby greater resistance may be offered to an attempted inrush or egress of air.
- Figure 1 is a vertical sectional view thereof; and Fig. 2 a transverse sectional view thereof.
- I provide adjacent the door opening 1, of the store, amusement hall or other place whose entrance opening it is undesirable to 'close, a vestibule 2 for more or less confining the air at the side, although this is not essential to my invention in its broader aspect, and in the floor or adjacent the bottom portion of the door opening I provide one or more air exhaust passages 3, 4, herein' shown as in the form of slits or long openings provided centrally in floor plates 5 parallel to the sill of the door, said slits 3,
- openings 3, 4 are similar openings 9, 10, adjacent the top of the door opening 1, herein shown as in the form f longitudinal nozzles of tubes or pipes 11, 1%, similar to the pipes'6, 7, and connected with the outlet end of the apparatus 8 bysuitable tubes or pipes 13, 14.
- openings 9, 10 adjacent the top of the door opening 1, herein shown as in the form f longitudinal nozzles of tubes or pipes 11, 1%, similar to the pipes'6, 7, and connected with the outlet end of the apparatus 8 bysuitable tubes or pipes 13, 14.
- each sheet of air will flow in a vertical plane but I prefer to provide means for causing this sheet or veil of air to be deflected, bulged or curved as indicated at 17, said means, as herein shown, consisting in mounting the tubes 11, 12, to rotate slightly, the roof 18 0f the vestibule on which said tubes are mounted being supported by brackets 19, and apertured at 20 to permit the nozzles 9, 10, to turn in one direction or the other as desired, said turning movement being accomplished by any suitable means as by levers 21, and handle rods 22 secured to tile ends of the tubes or pipes 11, 12.
- cooperating forced draft means having a long narrow opening adjacent the top of the doorway whereby a sheet-like blast of air may be maintained between said openings across the doorway.
Description
HFH. CUMMINGS.
AIR SOEEEN.
APPLICATION FILED FEB. 2, 1910.
Patented Feb. L4, 1911.
l W Q l |l| 1 M I W 1W *2 m MM! /5'- i ynuf l umWm]:W W I M'Whmm!iIihhlHHHHINHW 5%. I C v 7 Q if 3% M MJQL HENRY H. CUMMINGS, or NEWTON, MASSACHUSETTS.
AIR-SCREEN.
Specification or Letters Patent.
Patented Feb. 14., 1911.
Application filed February 2, 1910. Serial No. 541,475.
To all whom it may concern:
Be it known that I, HENRY H. CUM INGS, a citizen of the United States, residlng at Newton, in the county of Middlesex and.
State of Massachusetts, have invented an Improvement in Air-Screens, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.
Store keepers, proprietors of places of amusement, auctioneers, etc., find it desirable, and' in some cases imperative, to keep the front doors of their establishments open notwithstanding the objection that thereby the wind, dust, etc., from the street is liable to blow into the store or room.
My present invention has for its object the provision of means for preventing the wind,
, dust, etc., from blowing in through the open door, or, stated more broadly, for preventing the transverse -flow of air currents through the opening (of whatever kind) where it is desired to prevent said flow without closing a door or interposing an equivalent closure. I accomplish this object by providing an air veil or screen of air under pressure, flowing in a direction approximately parallel to the plane of the opening at or immediately adjacent said opening. I preferably have the air flow vertically downward, and
' preferably provide exhaust means in the floor for sucking the air downward from the door opening and thence forcing the air around to the top of the opening and downward, so that a forced draft in the form of a thin sheet or veil of air is continually flowing from the top downward to the bottom across the entire door opening. In my preferred construction I provide a vestibule containing means for a plurality of these wind barriers and means-for bending or diverting the veil from a strictly vertical plane so that thereby greater resistance may be offered to an attempted inrush or egress of air.
In-the drawings, in which I have shownone embodiment of my invention, Figure 1 is a vertical sectional view thereof; and Fig. 2 a transverse sectional view thereof.
In the preferred embodiment of my invention, I provide adjacent the door opening 1, of the store, amusement hall or other place whose entrance opening it is undesirable to 'close, a vestibule 2 for more or less confining the air at the side, although this is not essential to my invention in its broader aspect, and in the floor or adjacent the bottom portion of the door opening I provide one or more air exhaust passages 3, 4, herein' shown as in the form of slits or long openings provided centrally in floor plates 5 parallel to the sill of the door, said slits 3,
4 opening into exhaust tubes 6, 7, which are connected with the exhaust end of a fan blower or any other suitable apparatus 8.
Opposite the openings 3, 4, are similar openings 9, 10, adjacent the top of the door opening 1, herein shown as in the form f longitudinal nozzles of tubes or pipes 11, 1%, similar to the pipes'6, 7, and connected with the outlet end of the apparatus 8 bysuitable tubes or pipes 13, 14. Thus there is a constant down-pour of air from each pipe 11, 12, and the pipes 6,,7 respectively, there by forming a sheet, veil or screen between each vertical pair of tubes or pipes, as indicated by the arrows 15, 16.
Ordinarily each sheet of air will flow in a vertical plane but I prefer to provide means for causing this sheet or veil of air to be deflected, bulged or curved as indicated at 17, said means, as herein shown, consisting in mounting the tubes 11, 12, to rotate slightly, the roof 18 0f the vestibule on which said tubes are mounted being supported by brackets 19, and apertured at 20 to permit the nozzles 9, 10, to turn in one direction or the other as desired, said turning movement being accomplished by any suitable means as by levers 21, and handle rods 22 secured to tile ends of the tubes or pipes 11, 12. e
In use, when a gust of wind attempts to blow into the store or building through the door opening, it is met by the invisible air barrier 15 and barred further passage. I have found that such an air barrier will block the further passage of an ordinary gust of wind almost as effectually as a solid door. If a strong wind is blowing outdoors or for anyother reason there is a strong der more dense said quietbody of air, so that it cooperates with the two veils or screens 15 and 16-to afford more of a buffer or wall or body of opposition than one screen alone. For still further increasing the efficiency of the walls of air or airscreens, one or both of them maybe bulged outwardly as indicated at 17 simply by turning the nozzles v9, 10 correspondingly by means of the handles 22 and cranks 21. The vestibule 2 also cooperates with the invisible air veils or screens 15, 16 to render their operation more effective. a
While, for obvious reasons, it is preferable to have the air shield move downward, I do not intend to limit my invention thereto, and also it will be understood that I am not limited to various of the constructional details and preferred embodiments of the invention, as will be apparent from the following claims.
It will be understood that I have used the openingssuch as doorways, window openings, etc., in buildings and other structures Where such an invisible curtain or barrier is feasible.
Having described my invention, what I claim as new and desire to secure by Letters Patent is:
1. The combination with a doorway, of exhaust means having a long narrow opening adjacent the bottom of-the doorway, and
cooperating forced draft means having a long narrow opening adjacent the top of the doorway whereby a sheet-like blast of air may be maintained between said openings across the doorway.
2. The combination with a doorway, of means for maintaining a plurality of sheetlike blasts of air blowing approximately parallel to the doorway and having an intirvening neutral air space inclosed between t em.
3. The combination with a doorway, of
parallel to the doorway and having an intervening neutral air space-between them, and
means for deflecting one of said sheet-like blasts of air midway of its travel across the doorway.
4:. The combination with a doorway, of apparatus for maintaining a barrier of rapidly moving air having a sheet-like extent, said apparatus including means for maintaining one end of said sheet of air adjacent the top of the doorway and the other end thereof adjacent the bottom of the doorway. I
5. The combination with a doorway, of apparatus for maintaining a barrier of rapidly moving air having a sheetlike extent, said apparatus including a longitudinally apertured air-delivery pipe located adjacent the top of the doorway, a longitudinally apertured exhaust pipe located adjacent the bottom of the doorway, and mechanism for maintaining an air pressure in the former and an air exhaust in the latter.
6. The combination with a doorway, of apparatus for maintaining a barrier of rapidly moving air having a sheet-like extent, said apparatus including a longitudinally apertured air-delivery pipe located adjacent the top of the doorway, a longitudinally apertured exhaust pipe located adjacent the bottom of the doorway, and connecting means between said pipes for maintaining a forced circulation of air therethrough.
7. The combination with a doorway, of apparatus for maintaining a barrier of rapidly moving air having a sheet-like extent, said apparatus including a longitudinally apertured air-delivery pipe located adjacent the top of the doorway, a longitudinally apertured exhaust pipe located adjacent the bottom of the doorway, mechanism for maintaining an air pressure in the former and an air exhaust in the latter, and means for Varying the direction of the air blast from said upper pipe. 4
In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.
HENRY H. CUMMINGS.
Witnesses:
GEO. H. MAXWELL, EDWARD MAXWELL.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US54147510A US983877A (en) | 1910-02-02 | 1910-02-02 | Air-screen. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US54147510A US983877A (en) | 1910-02-02 | 1910-02-02 | Air-screen. |
Publications (1)
Publication Number | Publication Date |
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US983877A true US983877A (en) | 1911-02-14 |
Family
ID=3052230
Family Applications (1)
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---|---|---|---|
US54147510A Expired - Lifetime US983877A (en) | 1910-02-02 | 1910-02-02 | Air-screen. |
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Cited By (48)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2516432A (en) * | 1948-01-26 | 1950-07-25 | William M Spencer | Fluid film closure for building entrances and exits |
US2586797A (en) * | 1947-06-21 | 1952-02-26 | Westinghouse Electric Corp | Fire protection system |
US2664808A (en) * | 1948-04-29 | 1954-01-05 | Pullman Standard Car Mfg Co | Dining car kitchen ventilating system |
US2775187A (en) * | 1954-02-18 | 1956-12-25 | Cloise M Mcclurkin | Air circulating door for refrigerator |
DE959493C (en) * | 1953-07-02 | 1957-03-07 | Sulzer Ag | Device for forming an air curtain for separating two rooms |
DE962436C (en) * | 1954-07-27 | 1957-04-25 | Rudolf Sterkel | Cold room door with air curtain |
DE963811C (en) * | 1952-11-23 | 1957-05-16 | Krantz H Fa | Air curtain shielding a wall opening |
DE1048006B (en) * | 1953-03-31 | 1958-12-31 | Otto Heinz Brandi Dipl Ing | Device to prevent outside air from penetrating through air curtain screens |
DE1078587B (en) * | 1956-06-22 | 1960-03-31 | Albert Schnellpressen | Rotogravure printing machine with encapsulated drying device and with operating gaps for continuous observation and operation of the forme cylinder, the squeegee and the paper web |
US2935925A (en) * | 1957-04-22 | 1960-05-10 | D Ooge Leonard | Airseal closure device |
DE1082028B (en) * | 1956-09-28 | 1960-05-19 | Schilde Maschb Ag | Room shielding |
US2939374A (en) * | 1957-10-25 | 1960-06-07 | Sulzer Ag | Variable width air curtain protected doorway |
DE1085316B (en) * | 1952-11-19 | 1960-07-14 | Krantz H Fa | Air curtain for wall openings |
DE1095497B (en) * | 1954-05-12 | 1960-12-22 | Schilde Maschb Ag | Air door for dryers and industrial ovens |
DE1106473B (en) * | 1954-04-15 | 1961-05-10 | Schilde Maschb Ag | Shielding a room with an air curtain |
US3010379A (en) * | 1958-05-19 | 1961-11-28 | Carrier Corp | Air distribution system for a food display case |
US3023688A (en) * | 1958-05-16 | 1962-03-06 | Jr Fred A Kramer | Air barrier |
DE1128626B (en) * | 1959-06-10 | 1962-04-26 | Schilde Maschb Ag | Shielding a room against air exchange with another room |
US3038400A (en) * | 1958-12-16 | 1962-06-12 | V C Patterson & Associates Inc | Closure for cold storage warehouse service opening |
US3049984A (en) * | 1958-10-14 | 1962-08-21 | Svenska Flaektfabriken Ab | Air curtains |
US3092008A (en) * | 1957-11-06 | 1963-06-04 | Universal Match Corp | Air screens |
US3094851A (en) * | 1961-05-01 | 1963-06-25 | Dual Jet Refrigeration Company | Refrigeration cabinet and defrost |
DE1154252B (en) * | 1957-06-08 | 1963-09-12 | Rudolf Sterkel | Screening of room openings with an air curtain |
US3130559A (en) * | 1961-05-17 | 1964-04-28 | Dual Jet Refrigeration Company | Multiple jet conditioning cabinet |
US3134243A (en) * | 1960-09-06 | 1964-05-26 | Dual Jet Refrigeration Company | Refrigerated display case |
US3143952A (en) * | 1960-08-24 | 1964-08-11 | Dualjet Corp | Method and apparatus for conditioning gas |
US3157105A (en) * | 1961-08-01 | 1964-11-17 | Tamm Walter | Apparatus for producing an air curtain |
DE1189466B (en) * | 1959-10-01 | 1965-03-18 | Hisayoshi Kubodera | Tower for drying tape-shaped goods containing solvents |
US3190207A (en) * | 1962-11-06 | 1965-06-22 | P J Mac Inc | Air curtain |
US3207056A (en) * | 1963-02-05 | 1965-09-21 | Dravo Corp | Apparatus for shielding door openings by means of air |
US3211078A (en) * | 1963-06-06 | 1965-10-12 | Gunnar C F Asker | Air curtain |
US3251177A (en) * | 1963-05-15 | 1966-05-17 | Arthur K Baker | Dust-free bench |
DE1218692B (en) * | 1962-06-19 | 1966-06-08 | Bahco Ab | Arrangement for air curtains combined with sliding doors in the exterior walls of buildings |
DE1270771B (en) * | 1963-04-19 | 1968-06-20 | Minikay Ltd | Air barrier formed from two air curtains |
US3750622A (en) * | 1971-06-11 | 1973-08-07 | A Repp | Anti-pollution ventilation system for spray-type coating chambers |
US3797373A (en) * | 1972-07-19 | 1974-03-19 | Npi Corp | Air curtain |
US3834293A (en) * | 1972-11-22 | 1974-09-10 | L Danieli | Equipment for conveying smokes and products of the combustion in a smelting furnace |
US4074620A (en) * | 1975-11-06 | 1978-02-21 | Bror Ingvar Erling Jansson | Device for preventing the flow of air through an opening between two rooms or spaces |
US4140105A (en) * | 1973-12-04 | 1979-02-20 | Zinon Duvlis | Gas curtain for shielding person on an operating table |
EP0058782A1 (en) * | 1981-02-24 | 1982-09-01 | Stichting Ontwikkeling Koeltechniek | Cold-storage building |
WO1982002934A1 (en) * | 1981-02-24 | 1982-09-02 | Vahl Laszlo | Cold-storage building |
DK155809B (en) * | 1974-07-13 | 1989-05-16 | Zinon Duvlis | PROCEDURE AND APPARATUS FOR PROVIDING A CLEAN, NON-FREE SPACE OVER AN OPERATING FIELD |
US6565035B1 (en) * | 1999-11-11 | 2003-05-20 | The Boeing Company | Apparatus and method for forming an air curtain for use with an aircraft |
US20080293350A1 (en) * | 2005-12-09 | 2008-11-27 | Antonius Theodorus Cecilianus Hauzer | Ventilation System for Tunnel Section or Covered Road |
DE102010061007A1 (en) | 2010-04-29 | 2011-11-03 | Teddington Luftschleieranlagen Gmbh | Arrangement for separating entrance regions of building, has air blast generating devices arranged closer to inner and outer doors, where inner door lies opposite to each other at exhaust region of one of air blast generating devices |
US9050382B2 (en) | 2013-03-12 | 2015-06-09 | Peter Carr | Close proximity airborne influenza/pathogen mitigator |
WO2020221863A1 (en) * | 2019-04-30 | 2020-11-05 | Wirth Doors Limited | An active airflow inhibiting apparatus |
US11194259B2 (en) * | 2018-08-30 | 2021-12-07 | Taiwan Semiconductor Manufacturing Co., Ltd. | Equipment module with enhanced protection from airborne contaminants, and method of operation |
-
1910
- 1910-02-02 US US54147510A patent/US983877A/en not_active Expired - Lifetime
Cited By (49)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2586797A (en) * | 1947-06-21 | 1952-02-26 | Westinghouse Electric Corp | Fire protection system |
US2516432A (en) * | 1948-01-26 | 1950-07-25 | William M Spencer | Fluid film closure for building entrances and exits |
US2664808A (en) * | 1948-04-29 | 1954-01-05 | Pullman Standard Car Mfg Co | Dining car kitchen ventilating system |
DE1085316B (en) * | 1952-11-19 | 1960-07-14 | Krantz H Fa | Air curtain for wall openings |
DE963811C (en) * | 1952-11-23 | 1957-05-16 | Krantz H Fa | Air curtain shielding a wall opening |
DE1048006B (en) * | 1953-03-31 | 1958-12-31 | Otto Heinz Brandi Dipl Ing | Device to prevent outside air from penetrating through air curtain screens |
DE959493C (en) * | 1953-07-02 | 1957-03-07 | Sulzer Ag | Device for forming an air curtain for separating two rooms |
US2775187A (en) * | 1954-02-18 | 1956-12-25 | Cloise M Mcclurkin | Air circulating door for refrigerator |
DE1106473B (en) * | 1954-04-15 | 1961-05-10 | Schilde Maschb Ag | Shielding a room with an air curtain |
DE1095497B (en) * | 1954-05-12 | 1960-12-22 | Schilde Maschb Ag | Air door for dryers and industrial ovens |
DE962436C (en) * | 1954-07-27 | 1957-04-25 | Rudolf Sterkel | Cold room door with air curtain |
DE1078587B (en) * | 1956-06-22 | 1960-03-31 | Albert Schnellpressen | Rotogravure printing machine with encapsulated drying device and with operating gaps for continuous observation and operation of the forme cylinder, the squeegee and the paper web |
DE1082028B (en) * | 1956-09-28 | 1960-05-19 | Schilde Maschb Ag | Room shielding |
US2935925A (en) * | 1957-04-22 | 1960-05-10 | D Ooge Leonard | Airseal closure device |
DE1154252B (en) * | 1957-06-08 | 1963-09-12 | Rudolf Sterkel | Screening of room openings with an air curtain |
US2939374A (en) * | 1957-10-25 | 1960-06-07 | Sulzer Ag | Variable width air curtain protected doorway |
US3092008A (en) * | 1957-11-06 | 1963-06-04 | Universal Match Corp | Air screens |
US3023688A (en) * | 1958-05-16 | 1962-03-06 | Jr Fred A Kramer | Air barrier |
US3010379A (en) * | 1958-05-19 | 1961-11-28 | Carrier Corp | Air distribution system for a food display case |
US3049984A (en) * | 1958-10-14 | 1962-08-21 | Svenska Flaektfabriken Ab | Air curtains |
US3038400A (en) * | 1958-12-16 | 1962-06-12 | V C Patterson & Associates Inc | Closure for cold storage warehouse service opening |
DE1128626B (en) * | 1959-06-10 | 1962-04-26 | Schilde Maschb Ag | Shielding a room against air exchange with another room |
DE1189466B (en) * | 1959-10-01 | 1965-03-18 | Hisayoshi Kubodera | Tower for drying tape-shaped goods containing solvents |
US3143952A (en) * | 1960-08-24 | 1964-08-11 | Dualjet Corp | Method and apparatus for conditioning gas |
US3134243A (en) * | 1960-09-06 | 1964-05-26 | Dual Jet Refrigeration Company | Refrigerated display case |
US3094851A (en) * | 1961-05-01 | 1963-06-25 | Dual Jet Refrigeration Company | Refrigeration cabinet and defrost |
US3130559A (en) * | 1961-05-17 | 1964-04-28 | Dual Jet Refrigeration Company | Multiple jet conditioning cabinet |
US3157105A (en) * | 1961-08-01 | 1964-11-17 | Tamm Walter | Apparatus for producing an air curtain |
DE1218692B (en) * | 1962-06-19 | 1966-06-08 | Bahco Ab | Arrangement for air curtains combined with sliding doors in the exterior walls of buildings |
US3190207A (en) * | 1962-11-06 | 1965-06-22 | P J Mac Inc | Air curtain |
US3207056A (en) * | 1963-02-05 | 1965-09-21 | Dravo Corp | Apparatus for shielding door openings by means of air |
DE1270771B (en) * | 1963-04-19 | 1968-06-20 | Minikay Ltd | Air barrier formed from two air curtains |
US3251177A (en) * | 1963-05-15 | 1966-05-17 | Arthur K Baker | Dust-free bench |
US3211078A (en) * | 1963-06-06 | 1965-10-12 | Gunnar C F Asker | Air curtain |
US3750622A (en) * | 1971-06-11 | 1973-08-07 | A Repp | Anti-pollution ventilation system for spray-type coating chambers |
US3797373A (en) * | 1972-07-19 | 1974-03-19 | Npi Corp | Air curtain |
US3834293A (en) * | 1972-11-22 | 1974-09-10 | L Danieli | Equipment for conveying smokes and products of the combustion in a smelting furnace |
US4140105A (en) * | 1973-12-04 | 1979-02-20 | Zinon Duvlis | Gas curtain for shielding person on an operating table |
DK155809B (en) * | 1974-07-13 | 1989-05-16 | Zinon Duvlis | PROCEDURE AND APPARATUS FOR PROVIDING A CLEAN, NON-FREE SPACE OVER AN OPERATING FIELD |
US4074620A (en) * | 1975-11-06 | 1978-02-21 | Bror Ingvar Erling Jansson | Device for preventing the flow of air through an opening between two rooms or spaces |
WO1982002934A1 (en) * | 1981-02-24 | 1982-09-02 | Vahl Laszlo | Cold-storage building |
EP0058782A1 (en) * | 1981-02-24 | 1982-09-01 | Stichting Ontwikkeling Koeltechniek | Cold-storage building |
US6565035B1 (en) * | 1999-11-11 | 2003-05-20 | The Boeing Company | Apparatus and method for forming an air curtain for use with an aircraft |
US20080293350A1 (en) * | 2005-12-09 | 2008-11-27 | Antonius Theodorus Cecilianus Hauzer | Ventilation System for Tunnel Section or Covered Road |
US9546549B2 (en) * | 2005-12-09 | 2017-01-17 | Antonius Theodorus Cecilianus Hauzer | Ventilation system for tunnel section or covered road |
DE102010061007A1 (en) | 2010-04-29 | 2011-11-03 | Teddington Luftschleieranlagen Gmbh | Arrangement for separating entrance regions of building, has air blast generating devices arranged closer to inner and outer doors, where inner door lies opposite to each other at exhaust region of one of air blast generating devices |
US9050382B2 (en) | 2013-03-12 | 2015-06-09 | Peter Carr | Close proximity airborne influenza/pathogen mitigator |
US11194259B2 (en) * | 2018-08-30 | 2021-12-07 | Taiwan Semiconductor Manufacturing Co., Ltd. | Equipment module with enhanced protection from airborne contaminants, and method of operation |
WO2020221863A1 (en) * | 2019-04-30 | 2020-11-05 | Wirth Doors Limited | An active airflow inhibiting apparatus |
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