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EP0131198B1 - Roof ventilator - Google Patents

Roof ventilator Download PDF

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Publication number
EP0131198B1
EP0131198B1 EP84107334A EP84107334A EP0131198B1 EP 0131198 B1 EP0131198 B1 EP 0131198B1 EP 84107334 A EP84107334 A EP 84107334A EP 84107334 A EP84107334 A EP 84107334A EP 0131198 B1 EP0131198 B1 EP 0131198B1
Authority
EP
European Patent Office
Prior art keywords
roof
tubular body
rotor
shell
exhauster according
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.)
Expired
Application number
EP84107334A
Other languages
German (de)
French (fr)
Other versions
EP0131198A3 (en
EP0131198A2 (en
Inventor
Wilhelm Fritz Morschheuser
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.)
Rogal Gesellschaft fur Angewandte Lufttechnik Mbh
Original Assignee
ROBERTSON GAL GmbH
Rogal Gesellschaft fur Angewandte Lufttechnik Mbh
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 ROBERTSON GAL GmbH, Rogal Gesellschaft fur Angewandte Lufttechnik Mbh filed Critical ROBERTSON GAL GmbH
Publication of EP0131198A2 publication Critical patent/EP0131198A2/en
Publication of EP0131198A3 publication Critical patent/EP0131198A3/en
Application granted granted Critical
Publication of EP0131198B1 publication Critical patent/EP0131198B1/en
Expired 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
    • F24F13/24—Means for preventing or suppressing noise
    • 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
    • F24F7/02—Roof ventilation
    • F24F7/025—Roof ventilation with forced air circulation by means of a built-in ventilator

Definitions

  • the invention relates to a roof vent with an inlet diffuser that can be placed on a roof opening and an adjoining cylindrical pipe attachment, for which there is a covering cone at a vertical distance, forming an axial gap, the latter being covered at a radial distance by a cylindrical jacket, the lower one Section of the tubular attachment, a motor is arranged with a rotor carrying the blades of an axial fan, and with a substantially cylindrical tubular body which ends immediately above the rotor with a gap existing only for its rotation and is of the same diameter as the rotor.
  • a fan is known from DE-A-2 318 885.
  • the roof fan described is very well suited for forced ventilation of industrial buildings and halls when the axial blower is switched on, since the axial blower lies in the air flow in a flow-favorable manner.
  • these roof ventilators enable less natural ventilation that is still effective for many purposes. For this it is important on the one hand that a roof elevation is achieved by the pipe attachment, so that the buoyancy of the heated air to be discharged is increased accordingly.
  • the outer, cylindrical jacket at the height of the outlet gap regardless of the direction of the wind, deflects it in the area of the roof vent such that a negative pressure is created in the area of the outlet gap, which leads to the suction of the air.
  • the roof vent works when the engine is switched off on the one hand on the basis of the chimney effect as a lift vent and on the other hand on the basis of the wind deflection as a wind deflector.
  • a roof vent of a similar type is shown in US-A-3,012,495.
  • a cover cone with a downward-pointing tip is provided, which normally rests with its peripheral edge on the upper edge of the tube attachment. This overlap cone is raised only when the axial fan motor is switched on, so that the air can then flow out through the annular gap which forms. Accordingly, a combination effect with natural ventilation according to the chimney principle or the wind deflector principle is not achieved despite the sufficient height of the pipe attachment.
  • cover cones tapering downward for the purpose of flow deflection are also known according to GB-A-321 808.
  • the overlap cones begin immediately above the rotor carrying the blades.
  • the object of the invention is to further increase the ventilation performance when the axial fan is switched on and at the same time to continue to reduce the noise level caused by the operation of the axial fan without the function of the natural ventilation being impaired.
  • the cylindrical tubular body fills out that central part of the cross section of the tubular attachment in which there is a vortex formation which is typical of axial fans and reduces the output. Since the tubular body extends to the cover cone and is designed with a continuously increasing diameter in the upper section, it simultaneously initiates the flow deflection in a loss-free manner, which is continued by the cover cone. The otherwise existing impact effect associated with high pressure loss is thus avoided.
  • the tubular body develops its sound-absorbing effect on the one hand due to its cylindrical section and on the other hand due to the section with increasing diameter, the latter of which adjoins the covering cone.
  • the damping effect of the new tubular body thus goes beyond the preferably low frequency range of the noise. Particularly in the embodiment of the tubular body which ends at the bottom, excellent sound absorption occurs because the acoustic energy in the tubular body itself is destroyed by the latter acting as a resonator.
  • drawing shows the side view of the new roof vent, with the right half in longitudinal section and the left half partially is broken.
  • the roof 11 has an opening 12, the short shaft 13 of which is covered by a box 14.
  • the latter is expediently a sheet metal construction which is connected to the inlet diffuser 1.
  • the pipe attachment 2 connects to the inlet diffuser 1.
  • the required overall height is achieved by placing a lower ring section 2 'and an upper ring section 2 "on top of each other. Both the inlet diffuser 1 and the two ring sections 2' and 2" are double-skinned.
  • the inner shell of the inlet diffuser 1 and the upper ring section 2 is also made of perforated sheet metal.
  • the inner shell of the ring section 2 ' is made of non-perforated sheet metal, since it must have greater strength in order to hold the struts 15 for the motor 5 .
  • the covering cone 3 can be seen, which is shown in the exemplary embodiment with the tip pointing upwards. In this way, an annular gap 16 remains free.
  • the cylindrical jacket 4 is arranged at a radial distance from this ring gap. which serves to deflect the wind in the manner already described. Further wind deflectors are provided above and below the annular gap 16 by the annular plates 17 and 18.
  • the motor 5 arranged centrally in the flow path carries the rotor 10, on the circumference of which the vanes 6 are provided.
  • the arrangement is such that the wing 6 still ends below the upper edge of the ring section 2 ', so that the ring section 2' still partially and the ring section 2 "remain completely free.
  • the cylindrical tubular body 7 now projects into this free space.
  • the drawing shows that a cavity 19 is created by the cylindrical tubular body in connection with the covering cone, which has the function of a sound-absorbing resonator in the manner described.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Die Erfindung betrifft einen Dachentlüfter mit einem auf einer Dachöffnung auf setzbaren Einlaufdiffusor und einem sich daran anschließenden, zylindrischen Rohraufsatz, für den ein Überdeckungskegel im vertikalen Abstand unter Bildung eines axialen Spaltes besteht, welchletzterer mit radialem Abstand von einem zylindrischen Mantel überdeckt ist, wobei im unteren Abschnitt des Rohraufsatzes ein Motor mit einem die Flügel eines Axialgebläses tragenden Rotor angeordnet ist, und mit einem im wesentlichen zylindrischen Rohrkörper, der unmittelbar oberhalb des Rotors mit nur für dessen Drehung bestehendem Spalt endigt und von gleichem Durchmesser wie der Rotor ist. Ein solcher Lüfter ist aus der DE-A-2 318 885 bekannt.The invention relates to a roof vent with an inlet diffuser that can be placed on a roof opening and an adjoining cylindrical pipe attachment, for which there is a covering cone at a vertical distance, forming an axial gap, the latter being covered at a radial distance by a cylindrical jacket, the lower one Section of the tubular attachment, a motor is arranged with a rotor carrying the blades of an axial fan, and with a substantially cylindrical tubular body which ends immediately above the rotor with a gap existing only for its rotation and is of the same diameter as the rotor. Such a fan is known from DE-A-2 318 885.

Bei einem Dachentlüfter dieser Art kommt es zu einer Kernströmung durch den zylindrischen Rohrkorper und zu einer Mantelströmung zwischen dem zylindrischen Rohrkörper und dem Rohraufsatz, wodurch eine Schalldämmung im Bereich der tiefen Frequenzen um etwa 10 bis 12 dB erreicht wird, während die höheren Frequenzen mit Hilfe der axialen Überdeckung, die in diesem Falle als ein mit Schalldämm-Material gefüllter Doppelkegel ausgebildet ist, um etwa 2 dB gedämpft werden.In a roof vent of this type, there is a core flow through the cylindrical tube body and a jacket flow between the cylindrical tube body and the pipe attachment, whereby a sound insulation in the range of low frequencies by about 10 to 12 dB is achieved, while the higher frequencies with the help of axial overlap, which in this case is designed as a double cone filled with sound insulation material, is attenuated by approximately 2 dB.

Weiterhin eignet sich der beschriebene Dachlüfter bei eingeschaltetem Axialgebläse sehr gut zur forcierten Entlüftung von Industriegebäuden und Hallen, da das Axialgebläse strömungsgünstig in der Luftströmung liegt. Bei abgeschaltetem Motor ermöglichen diese Dachentlüfter eine geringere, aber für viele Zwecke auch noch wirksame natürliche Lüftung. Hierfür ist einerseits maßgeblich, daß durch den Rohraufsatz eine Dachüberhöhung erzielt wird, so daß der Auftrieb der erwärmten, abzuführenden Luft entsprechend vergrößert ist. Andererseits wird durch den äußeren, zylindrischen Mantel in Höhe des Austrittsspaltes unabhängig von der Richtung des Windes eine Ablenkung desselben im Bereich des Dachentlüfters derart erzielt, daß im Bereich des Austrittsspaltes ein Unterdruck entsteht, der zur Absaugung der Luft führt. Somit arbeitet der Dachentlüfter bei abgeschaltetem Motor einerseits auf der Grundlage der Kaminwirkung als Auftriebsentlüfter und andererseits auf der Grundlage der Windablenkung als Windleitflächenentlüfter.Furthermore, the roof fan described is very well suited for forced ventilation of industrial buildings and halls when the axial blower is switched on, since the axial blower lies in the air flow in a flow-favorable manner. When the engine is switched off, these roof ventilators enable less natural ventilation that is still effective for many purposes. For this it is important on the one hand that a roof elevation is achieved by the pipe attachment, so that the buoyancy of the heated air to be discharged is increased accordingly. On the other hand, the outer, cylindrical jacket at the height of the outlet gap, regardless of the direction of the wind, deflects it in the area of the roof vent such that a negative pressure is created in the area of the outlet gap, which leads to the suction of the air. Thus, the roof vent works when the engine is switched off on the one hand on the basis of the chimney effect as a lift vent and on the other hand on the basis of the wind deflection as a wind deflector.

Ein Dachentlüfter ähnlicher Art ist in der US-A-3 012 495 dargestellt. Dabei ist ein Überdeckungskegel mit nach unten weisender Spitze vorgesehen, der normalerweise mit seinem Umfangsrand auf der oberen Randkante des Rohraufsatzes aufliegt. Lediglich bei eingeschaltetem Motor des Axialgebläses wird dieser Überdeckungskegel angehoben, so daß dann die Luft durch den sich bildenden, ringförmigen Spalt ausströmen kann. Demnach wird hierbei eine Kombinationswirkung mit einer natürlichen Entlüftung nach dem Kaminprinzip oder dem Windleitflächenprinzip trotz hinreichender Höhe des Rohraufsatzes nicht erzielt.A roof vent of a similar type is shown in US-A-3,012,495. A cover cone with a downward-pointing tip is provided, which normally rests with its peripheral edge on the upper edge of the tube attachment. This overlap cone is raised only when the axial fan motor is switched on, so that the air can then flow out through the annular gap which forms. Accordingly, a combination effect with natural ventilation according to the chimney principle or the wind deflector principle is not achieved despite the sufficient height of the pipe attachment.

Von unter dem Gesichtspunkt einer geringfügigen Bauhöhe entwickelten Dachentlüftern, bei denen die eingangs bezeichnete natürliche Entlüftung nicht vorgesehen ist, sind sich nach unten verjüngende Überdeckungskegel zum Zwecke der Strömungsumlenkung weiterhin nach der GB-A-321 808 bekannt. Hierbei setzen die Überdeckungskegel unmittelbar oberhalb des die Flügel tragenden Rotors ein.From roof ventilators developed from the point of view of a slight overall height, in which the natural ventilation referred to at the outset is not provided, cover cones tapering downward for the purpose of flow deflection are also known according to GB-A-321 808. Here, the overlap cones begin immediately above the rotor carrying the blades.

Vom einleitend wiedergegebenen Stand der Technik ausgehend liegt der Erfindung die Aufgabe zugrunde, die Entlüftungsleistung bei eingeschaltetem Axialgebläse weiterhin zu steigern und gleichzeitig den durch den Betrieb des Axialgebläses bedingten Lärmpegel weiterhin herabzusetzen, ohne daß die Funktion der natürlichen Entlüftung beeinträchtigt wird.On the basis of the prior art reproduced in the introduction, the object of the invention is to further increase the ventilation performance when the axial fan is switched on and at the same time to continue to reduce the noise level caused by the operation of the axial fan without the function of the natural ventilation being impaired.

Diese Aufgabenstellung löst die Erfindung durch die in den Patentansprüchen gemachten Vorschläge.The invention solves this problem by means of the suggestions made in the claims.

Der zylindrische Rohrkörper füllt im Anschluß an den Rotor denjenigen zentral gelegenen Teil des Querschnittes des Rohraufsatzes aus, in welchem es zu einer für Axialgebläse typischen, die Leistung herabsetzenden Wirbelbildung kommt. Da der Rohrkörper bis zum Überdeckungskegel reicht und im oberen Abschnitt mit stetig zunehmendem Durchmesser ausgeführt ist, leitet er gleichzeitig in verlustfreier Weise die Strömungsumlenkung ein, welche vom Überdeckungskegel fortgesetzt wird. Die sonst bestehende, mit hohem Druckverlust verbundene Aufprallwirkung wird damit vermieden. Der Rohrkörper entfaltet seine schalldämmende Wirkung einerseits auf Grund seines zylindrischen Abschnittes und andererseits auf Grund des mit zunehmendem Durchmesser versehenen Abschnittes, welchletzterer sich an den Überdeckungskegel anschließt. Damit geht die Dämpfungswirkung des neuen Rohrkörpers über den bevorzugt niedrigen Frequenzbereich des Lärms hinaus. Vor allem bei der unten offen endigenden Ausführungsform des Rohrkörpers kommt eine hervorragende Schallabsorption zustande, weil die Schallenergie im Rohrkörper selbst vernichtet wird, indem letzterer als ein Resonator wirkt.Following the rotor, the cylindrical tubular body fills out that central part of the cross section of the tubular attachment in which there is a vortex formation which is typical of axial fans and reduces the output. Since the tubular body extends to the cover cone and is designed with a continuously increasing diameter in the upper section, it simultaneously initiates the flow deflection in a loss-free manner, which is continued by the cover cone. The otherwise existing impact effect associated with high pressure loss is thus avoided. The tubular body develops its sound-absorbing effect on the one hand due to its cylindrical section and on the other hand due to the section with increasing diameter, the latter of which adjoins the covering cone. The damping effect of the new tubular body thus goes beyond the preferably low frequency range of the noise. Particularly in the embodiment of the tubular body which ends at the bottom, excellent sound absorption occurs because the acoustic energy in the tubular body itself is destroyed by the latter acting as a resonator.

Eine doppelschalige Ausbildung mit einer zwischen Außenschale und Innenschale vorgesehenen Zellenstruktur, die bevorzugt geschlossenporig ist, führt zu einer zusätzlichen Verstärkung der Schallabsorption. Eine weitere Steigerung wird noch durch die Ausbildung der Außenschale aus einem flexiblen Kunststoff, zweckmäßig mit Lochungen, erreicht.A double-shell design with a cell structure provided between the outer shell and the inner shell, which preferably has closed pores, leads to an additional amplification of the sound absorption. A further increase is achieved by forming the outer shell from a flexible plastic, advantageously with perforations.

Zur weiteren Veranschaulichung der Erfindung wird auf die sich auf ein Ausführungsbeispiel beziehende Zeichnung Bezug genommen. Die Zeichnung zeigt die seitliche Ansicht des neuen Dachentlüfters, wobei die rechte Hälfte im Längsschnitt und die linke Hälfte teilweise gebrochen wiedergegeben ist.To further illustrate the invention, reference is made to the drawing relating to an exemplary embodiment. The drawing shows the side view of the new roof vent, with the right half in longitudinal section and the left half partially is broken.

Das Dach 11 weist eine Öffnung 12 auf, deren kurzer Schacht 13 mittels eines Kastens 14 überdeckt ist. Letzterer ist zweckmäßig eine Blechkonstruktion, die in Verbindung mit dem Einlaufdiffusor 1 steht. An den Einlaufdiffusor 1 schließt sich der Rohraufsatz 2 an. Dessen erforderliche Gesamthöhe wird erreicht, indem ein unterer Ringabschnitt 2' und ein oberer Ringabschnitt 2" aufeinander gesetzt sind. Sowohl der Einlaufdiffusor 1 als auch die beiden Ringabschnitte 2' und 2" sind doppelschalig ausgeführt. Die Innenschale ist beim Einlaufdiffusor 1 sowie beim oberen Ringabschnitt 2" darüber hinaus aus gelochtem Blech hergestellt. Die Innenschale des Ringsabschnittes 2' ist demgegenüber aus ungelochtem Blech hergestellt, da sie eine größere Festigkeit besitzen muß, um die Streben 15 für den Motor 5 zu halten.The roof 11 has an opening 12, the short shaft 13 of which is covered by a box 14. The latter is expediently a sheet metal construction which is connected to the inlet diffuser 1. The pipe attachment 2 connects to the inlet diffuser 1. The required overall height is achieved by placing a lower ring section 2 'and an upper ring section 2 "on top of each other. Both the inlet diffuser 1 and the two ring sections 2' and 2" are double-skinned. The inner shell of the inlet diffuser 1 and the upper ring section 2 "is also made of perforated sheet metal. In contrast, the inner shell of the ring section 2 'is made of non-perforated sheet metal, since it must have greater strength in order to hold the struts 15 for the motor 5 .

Mit vertikalem Abstand oberhalb der Oberkante des Ringabschnittes 2" erkennt man den Überdeckungskegel 3, der im Ausführungsbeispiel mit nach oben weisender Spitze dargestellt ist. Auf diese Weise entsteht ein frei bleibender Ringspalt 16. Mit radialem Abstand von diesem Ringspalt ist der zylindrische Mantel 4 angeordnet, der der Windablenkung in der bereits beschriebenen Weise dient. Weitere Windleitbleche sind oberhalb und unterhalb des Ringsspaltes 16 durch die Ringbleche 17 und 18 vorgesehen.At a vertical distance above the upper edge of the ring section 2 ″, the covering cone 3 can be seen, which is shown in the exemplary embodiment with the tip pointing upwards. In this way, an annular gap 16 remains free. The cylindrical jacket 4 is arranged at a radial distance from this ring gap. which serves to deflect the wind in the manner already described. Further wind deflectors are provided above and below the annular gap 16 by the annular plates 17 and 18.

Der zentral im Strömungsweg angeordnete Motor 5 trägt den Rotor 10, an dessen Umfang die Flügel 6 vorgesehen sind. Die Anordnung ist dabei so getroffen, daß der Flügel 6 noch unterhalb der Oberkante des Ringabschnittes 2' endigt, so daß der Ringabschnitt 2' noch teilweise und der Ringabschnitt 2" vollständig frei bleiben.The motor 5 arranged centrally in the flow path carries the rotor 10, on the circumference of which the vanes 6 are provided. The arrangement is such that the wing 6 still ends below the upper edge of the ring section 2 ', so that the ring section 2' still partially and the ring section 2 "remain completely free.

In diesen freien Raum ragt nun der zylindrische Rohrkörper 7 hinein. Man erkennt die Außenschale 8 und die Innenschale 9 sowie die zwischen den beiden Schalen befindliche Zellenstruktur. Oberhalb des Ringabschnittes 2" besteht eine zunehmende, nach außen gerichtete Krümmung des Rohrkörpers 7, der auf diese Weise die Strömungsumlenkung nahezu verlustfrei einleitet.The cylindrical tubular body 7 now projects into this free space. One recognizes the outer shell 8 and the inner shell 9 as well as the cell structure located between the two shells. Above the ring section 2 ″ there is an increasing outward curvature of the tubular body 7, which in this way initiates the flow deflection with almost no loss.

Zugleich zeigt die Zeichnung, daß durch den zylindrischen Rohrkörper in Verbindung mit dem Überdeckungskegel ein Hohlraum 19 geschaffen wird, welcher in der beschriebenen Weise die Funktion eines schalldämpfenden Resonators hat.At the same time, the drawing shows that a cavity 19 is created by the cylindrical tubular body in connection with the covering cone, which has the function of a sound-absorbing resonator in the manner described.

Claims (6)

1. Roof exhauster with an inlet diffuser (1) attachable to an opening in the roof and a subsequent cylindrical tubular attachment (2), for which there exists a vertically spaced covering cone (3) forming an axial gap, said gap being covered with a horizontal spacing by a cylindrical shell (4), a motor (5) with a rotor (10) carrying the vanes (6) of an axial-flow blower being arranged in the lower section of the tubular attachment, and with an essentially cylindrical tubular body (7), which ends directly above the rotor (10) in a gap provided only for the rotation of, and of the same diameter as, the rotor (10), characterized in that the tubular body (7) extends to the covering cone (3) and is widened above the tubular attachment (2) with an increasing diameter up to a point located inside the covering cone (3).
2. Roof exhauster according to claim 1, characterized in that the tubular body (7) is a double-shell design with a cellular structure between its outer shell (8) and its inner shell (9).
3. Roof exhauster according to claim 2, characterized in that the cellular structure is closed-porous.
4. Roof exhauster according to claims 2 and 3, characterized in that the outer shell (8) consists of a flexible plastic foil.
5. Roof exhauster according to claims 2 to 4, characterized in that the outer shell (8) is perforated.
6. Roof exhauster according to claims 1 to 5, characterized in that the tubular body (7) is open ended at the bottom.
EP84107334A 1983-07-06 1984-06-26 Roof ventilator Expired EP0131198B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833324369 DE3324369A1 (en) 1983-07-06 1983-07-06 ROOF VENTILATOR
DE3324369 1983-07-06

Publications (3)

Publication Number Publication Date
EP0131198A2 EP0131198A2 (en) 1985-01-16
EP0131198A3 EP0131198A3 (en) 1986-07-30
EP0131198B1 true EP0131198B1 (en) 1988-11-02

Family

ID=6203307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107334A Expired EP0131198B1 (en) 1983-07-06 1984-06-26 Roof ventilator

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EP (1) EP0131198B1 (en)
DE (2) DE3324369A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2001219C2 (en) * 2008-01-25 2009-07-30 Ubbink Bv Roof terminal for ventilation through roof of building, has connecting piece with base part for installation on roof, and axial fan driven by electric motor, where electric motor is connected to rigid handle shaft of axial fan
RU198629U1 (en) * 2020-01-30 2020-07-21 Федеральное государственное бюджетное образовательное учреждение высшего образования "Пензенский государственный университет архитектуры и строительства" Deflector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL262265A (en) * 1960-03-11 1900-01-01
FR2128939A5 (en) * 1971-03-09 1972-10-27 Dassault Aeronautique
DE2318885A1 (en) * 1973-04-14 1974-10-24 Gal Ges Fuer Angewandte Luftte ROOF VENTILATOR

Also Published As

Publication number Publication date
DE3324369A1 (en) 1985-01-17
DE3474995D1 (en) 1988-12-08
EP0131198A3 (en) 1986-07-30
EP0131198A2 (en) 1985-01-16

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