EP0045351A2 - Non-return valve for rectangular gas ducts - Google Patents

Non-return valve for rectangular gas ducts Download PDF

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Publication number
EP0045351A2
EP0045351A2 EP81103301A EP81103301A EP0045351A2 EP 0045351 A2 EP0045351 A2 EP 0045351A2 EP 81103301 A EP81103301 A EP 81103301A EP 81103301 A EP81103301 A EP 81103301A EP 0045351 A2 EP0045351 A2 EP 0045351A2
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EP
European Patent Office
Prior art keywords
frame
flap
backflow
flaps
ventilation
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
EP81103301A
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German (de)
French (fr)
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EP0045351A3 (en
EP0045351B1 (en
Inventor
Hans-Joachim Naber
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.)
Naber and Co KG
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Naber and Co KG
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Publication date
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Publication of EP0045351A2 publication Critical patent/EP0045351A2/en
Publication of EP0045351A3 publication Critical patent/EP0045351A3/en
Application granted granted Critical
Publication of EP0045351B1 publication Critical patent/EP0045351B1/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

Definitions

  • the invention relates to a backflow flap according to the preamble of claim 1.
  • Such backflow flaps were previously attached to the ventilation channels as individual parts. They were often located on the outside of the ventilation channels, i.e. generally attached to the outer wall of the building in the form of a plurality of flaps arranged one below the other. These flaps were exposed to weather and wind and caused wind noise. Depending on the wind, they were also opened a slot so that drafts penetrated inwards and the intended effect of preventing a backflow against the ventilation flow was not achieved. Such backflow flaps were also unsuitable for preventing insects from entering the building. On the other hand, it was not possible to install fine-meshed insect screens after the backflow flaps forming the outer end of the ventilation channels.
  • backflow flaps For many purposes, it has so far not been possible to attach backflow flaps. This applies in particular to various distribution ducts, for example Y distributors or trousers, cross distributors, etc. In terms of production, it has so far been practically impossible or only possible with great effort to provide backflow flaps in the individual supply air and exhaust air ducts. As a result, the air streams were mixed and undesirable exhaust gases were often directed to where they should not be directed. This fact has also led to strict building regulations regarding the introduction of exhaust gases from different sources into a common ventilation chimney.
  • flat duct systems which are mainly used as ventilation ducts in extractor hoods, clothes dryers and small ventilation systems as well as small ventilation systems.
  • Such flat channels are usually about 7 to 20 cm wide and only 3 to 15 cm high. The same applies to use in flat, rectangular, flexible hoses that are used for the same purposes.
  • the invention has for its object to design a backflow valve according to the preamble of claim 1 so that it can be used as an insert in different types of ventilation channels and at different depths is.
  • Such a backflow flap can thus be inserted into any ventilation channel. If, for example, it is inserted into the outer opening of a ventilation duct attached to an outer wall of the building, the individual flaps are arranged in the interior of the frame in a manner protected from wind and weather. Rattling is avoided, as is weather impairment. It is easily possible to install an insect screen on the outer wall even after the backflow flap.
  • the backflow flap according to the invention can be inserted as far as required into the ventilation channels. If, for example, the backflow flap is in the outermost position under unfavorable wind conditions, it will still rattle the flap and thus also the penetration of outside air into the interior of the building, this can easily be remedied by moving the backflow flap a little further towards the interior of the building.
  • the backflow flap according to the subject of the invention can be used particularly advantageously in various distribution channels, for example Y-shaped distribution channels.
  • distribution channels are usually made of sheet metal or plastic, without the possibility of attaching backflow flaps to the respective flow-side ends of the branch channels, so that undesired mixing of the individual air streams resulted.
  • the lower inside of the frame is inclined slightly downward downstream. The purpose of this is to ensure that any liquids that may come into contact with the backflow flap from the outside or condensate water formed thereon are drained off to the outside. It is thus possible to achieve further advantages with the object of the invention the installation of stacked flaps on the outside wall of the building could not be achieved.
  • Two backflow flaps are expediently arranged one above the other and are articulated on the side walls of the frame.
  • the upper edge of the lower backflow flap can serve as a stop for the free end of the upper backflow flap.
  • the arrangement of two backflow flaps one above the other has proven particularly useful in the usual dimensions of backflow flaps, the width of such flaps being approximately 1 m to 1.5 m and the height approximately 50 cm to 1 m.
  • Metal sheet for example galvanized sheet metal, or plastic such as polypropylene is expediently used as the material for the backflow flap.
  • the backflow flap is generally designated 1. It has a rectangular frame 2. In this frame 2, two flaps 3 and 4 are arranged one above the other. These flaps are hinged to the side walls 6 and 7 of the frame 2.
  • the upper edge 9 of the lower flap 4 also serves as a stop for the free end of the upper flap 3.
  • For the free end of the lower flap 4 serve two stops 8 provided inside the frame 2 as a stop.
  • the direction of flow through the backflow flap is indicated in FIG. 2 by arrows.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Flow Control Members (AREA)
  • Ventilation (AREA)

Abstract

1. A backpressure stop valve for use in rectangular gas-conducting passages, comprising a frame (2) adapted to be inserted into a passage and having substantially flat outer surfaces, and comprising closure means secured to said frame (2) and pivotable in flap-fashion into sealing relationship against said frame (2), characterized in that a) said closure means is formed of two superposed flaps (3, 4) having their pivot axes disposed in the vicinity of the inlet port for a stream of gas within said frame (2), b) the height of each of said flaps (3, 4), which extends transversely to the pivot axis, is smaller than the depth of said frame (2), said frame (2) being of cuboid configuration and being disposed perpendicularly or, respectively, in parallel to the longitudinal extension of said passage, and c) a lower abutment (8) is provided at the bottom (5) of said frame (2) for the lower edge of the lower flap (4) and an upper abutment (9) is provided for the lower edge of the upper flap (3), the upper edge or, respectively, pivotable arrangement of said lower flap (4) simultaneously forming said abutment (9) for said lower edge of said upper flap (3).

Description

Die Erfindung bezieht sich auf eine Rückstauklappe gemäß dem Oberbegriff des Anspruches 1.The invention relates to a backflow flap according to the preamble of claim 1.

Derartige Rückstauklappen wurden bisher an die Entlüftungskanäle als einzelne Teile angehängt. Häufig wurden sie an der Außenseite der Entlüftungskanäle, d.h. im allgemeinen an der Außenwand des Gebäudes, in Form von mehreren untereinander angeordneten Klappen angebracht. Diese Klappen waren Wetter und Wind ausgesetzt und verursachten Windgeräusche. Je nach Wind wurden sie auch einen Schlitz weit geöffnet, so daß Zugluft nach innen drang und die beabsichtigte Wirkung, einen Rückstau entgegen der Entlüftungsströmung zu verhindern, nicht erreicht wurde. Derartige Rückstauklappen waren auch nicht geeignet, Insekten am Eindringen ins Gebäudeinnere zu hindern. Andererseits war es nicht möglich, im Anschluß an die den Außenabschluß der Entlüftungskanäle bildenden Rückstauklappen feinmaschige Insektengitter anzubringen.Such backflow flaps were previously attached to the ventilation channels as individual parts. They were often located on the outside of the ventilation channels, i.e. generally attached to the outer wall of the building in the form of a plurality of flaps arranged one below the other. These flaps were exposed to weather and wind and caused wind noise. Depending on the wind, they were also opened a slot so that drafts penetrated inwards and the intended effect of preventing a backflow against the ventilation flow was not achieved. Such backflow flaps were also unsuitable for preventing insects from entering the building. On the other hand, it was not possible to install fine-meshed insect screens after the backflow flaps forming the outer end of the ventilation channels.

Für viele Einsatzzwecke war es bisher überhaupt nicht möglich, Rückstauklappen anzubringen. Dies gilt insbesondere für diverse Verteilerkanäle, beispielsweise Y-Verteiler oder Hosenstücke, Kreuzverteiler etc. Herstellungsmäßig war es bisher praktisch nicht möglich oder nur mit größtem Aufwand möglich, in den einzelnen Zuluft- bzw. AbluftkanälenRückstauklappen vorzusehen. Die Folge davon war, daß die Luftströme vermischt wurden und häufig unerwünschte Abgase dorthin gelenkt wurden, wo sie nicht hingeleitet werden sollten. Diese Tatsache hat auch zu strengen bauaufsichtlichen Vorschriften bezüglich der Einleitung von Abgasen aus verschiedenen Quellen in einen gemeinsamen Entlüftungskamin geführt.For many purposes, it has so far not been possible to attach backflow flaps. This applies in particular to various distribution ducts, for example Y distributors or trousers, cross distributors, etc. In terms of production, it has so far been practically impossible or only possible with great effort to provide backflow flaps in the individual supply air and exhaust air ducts. As a result, the air streams were mixed and undesirable exhaust gases were often directed to where they should not be directed. This fact has also led to strict building regulations regarding the introduction of exhaust gases from different sources into a common ventilation chimney.

Auch für sogenannte Flachkanalsysteme, die überwiegend als Entlüftungskanäle bei Dunstabzughauben, Wäschetrocknern und Kleinentlüftungsanlagen sowie Kleinbelüftungsanlagen eingesetzt werden, gibt es bis jetzt keine geeigneten Rückstauklappen. Derartige Flachkanäle sind in der Regel ca. 7 bis 20 cm breit und lediglich 3 bis 15 cm hoch. Ähnliches gilt für den Einsatz in flachen, rechteckigen, flexiblen Schläuchen, die für die gleichen Verwendungszwecke eingesetzt werden.There are also no suitable backflow flaps for so-called flat duct systems, which are mainly used as ventilation ducts in extractor hoods, clothes dryers and small ventilation systems as well as small ventilation systems. Such flat channels are usually about 7 to 20 cm wide and only 3 to 15 cm high. The same applies to use in flat, rectangular, flexible hoses that are used for the same purposes.

Der Erfindung liegt die Aufgabe zugrunde, eine Rückstauklappe gemäß dem Oberbegriff des Anspruches 1 so auszubilden, daß sie als Einsatzteil in verschiedenartige Entlüftungskanäle und in unterschiedlichen Tiefen einsetzbar ist.The invention has for its object to design a backflow valve according to the preamble of claim 1 so that it can be used as an insert in different types of ventilation channels and at different depths is.

Die Aufgabe wird erfindungsgemäß durch die Merkmale des Kennzeichens des Anspruches 1 gelöst. Weitere Ausbildungen der Erfindung sind in den Unteransprüchen dargestellt.The object is achieved by the features of the characterizing part of claim 1. Further developments of the invention are presented in the subclaims.

Gemäß dem Erfindungsgegenstand weist eine Rückstauklappe folgende Merkmale auf:

  • a) einen rechteckigen Rahmen, dessen Außenflächen und Außenbegrenzungen zum Einschieben in die Entlüftungskanäle im wesentlichen eben ausgebildet sind,
  • b) wenigstens eine Rückstauklappe, die im Inneren des Rahmens in der Nähe des Eintritts der Entlüftungsströmung angelenkt ist, und deren Höhe etwas geringer als die Tiefe des Rahmens ist,
  • c) Anschläge für das freie Ende der Rückstauklappe, die ein Durchschwingen der Rückstauklappe entgegen der Entlüftungsströmung verhindern.
According to the subject matter of the invention, a backflow flap has the following features:
  • a) a rectangular frame, the outer surfaces and outer limits of which are essentially flat for insertion into the ventilation ducts,
  • b) at least one backflow flap, which is articulated in the interior of the frame in the vicinity of the inlet of the ventilation flow and the height of which is somewhat less than the depth of the frame,
  • c) stops for the free end of the backflow flap, which prevent the backflow flap from swinging against the venting flow.

Eine derartige Rückstauklappe kann somit in jeden beliebigen Entlüftungskanal eingeschoben werden. Wird sie beispielsweise in die äußere Öffnung eines an einer Gebäudeaußenwand angebrachten Lüftungskanals eingeschoben, so sind die einzelnen Klappen wind- und wettergeschützt im Inneren des Rahmens angeordnet. Ein Klappern wird damit ebenso wie eine Witterungsbeeinträchtigung vermieden. Es ist ohne weiteres möglich, an der Außenwand selbst im Anschluß an die Rückstauklappe ein Insektengitter anzubringen.Such a backflow flap can thus be inserted into any ventilation channel. If, for example, it is inserted into the outer opening of a ventilation duct attached to an outer wall of the building, the individual flaps are arranged in the interior of the frame in a manner protected from wind and weather. Rattling is avoided, as is weather impairment. It is easily possible to install an insect screen on the outer wall even after the backflow flap.

Die Rückstauklappe gemäß der Erfindung läßt sich beliebig weit in die Entlüftungskanäle einschieben. Sollte beispielsweise in der äußersten Stellung der Rückstauklappe unter ungünstigen Windverhältnisssen noch ein Klappern der Klappe und somit auch ein Eindringen von Außenluft ins Gebäudeinnere erfolgen, so kann dies leicht dadurch abgestellt werden, daß man die Rückstauklappe noch ein bißchen weiter in Richtung auf das Gebäudeinnere verschiebt.The backflow flap according to the invention can be inserted as far as required into the ventilation channels. If, for example, the backflow flap is in the outermost position under unfavorable wind conditions, it will still rattle the flap and thus also the penetration of outside air into the interior of the building, this can easily be remedied by moving the backflow flap a little further towards the interior of the building.

Es ist auch möglich, die Rückstauklappe unmittelbar in eine Maueröffnung, die in diesem Fall als Entlüftungskanal dient, in die den Umständen entsprechende Stellung innerhalb des Mauerdurchbruches einzuschieben und zuzumauern. Die Vorteile bleiben auch in diesem Falle erhalten.It is also possible to push the backflow flap directly into a wall opening, which in this case serves as a ventilation duct, into the position within the wall opening corresponding to the circumstances and to wall it up. The advantages remain in this case.

Besonders vorteilhaft ist die Rückstauklappe nach dem Gegenstand der Erfindung bei diversen Verteilerkanälen, beispielsweise Y-förmigen Verteilerkanälen einsetzbar. Derartige Verteilerkanäle werden üblicherweise aus Blech oder aus Kunststoff hergestellt, ohne daß die Möglichkeit bestünde, an den jeweiligen strömungsseitigen Enden der Abzweigkanäle Rückstauklappen anzubringen, so daß sich unerwünschte Vermischungen der einzelnen Luftströme ergaben.The backflow flap according to the subject of the invention can be used particularly advantageously in various distribution channels, for example Y-shaped distribution channels. Such distribution channels are usually made of sheet metal or plastic, without the possibility of attaching backflow flaps to the respective flow-side ends of the branch channels, so that undesired mixing of the individual air streams resulted.

Dies kann durch den Gegenstand der Erfindung sehr leicht dadurch behoben werden, daß man einfach vom offenen Ende her je eine als Einsatzteil ausgebildete Rückstauklappe bis zum Ende dieser Abzweigung einschiebt, und zwar so, daß nur ein Durchlaß in der gewünschten Richtung möglich ist.This can be very easily remedied by the subject matter of the invention by simply inserting a backflow flap, designed as an insert, from the open end to the end of this branch, in such a way that only a passage in the desired direction is possible.

Nach einer weiteren Ausbildung der Erfindung ist die untere Innenseite des Rahmens strömungsabwärts leicht nach unten geneigt. Dies dient dazu, daß eventuell von außen auf die Rückstauklappe auftreffende Flüssigkeiten oder daran entstehendes Kondenswasser nach außen abgeleitet wird. Es ist somit möglich, mit dem Gegenstand der Erfindung weitere Vorteile zu erzielen, die durch den Anbau von übereinander angeordneten Klappen an der Gebäudeaußenwand nicht zu erzielen waren.According to a further embodiment of the invention, the lower inside of the frame is inclined slightly downward downstream. The purpose of this is to ensure that any liquids that may come into contact with the backflow flap from the outside or condensate water formed thereon are drained off to the outside. It is thus possible to achieve further advantages with the object of the invention the installation of stacked flaps on the outside wall of the building could not be achieved.

Zweckmäßigerweise sind zwei Rückstauklappen übereinander angeordnet und werden an den Seitenwänden des Rahmens angelenkt. Dabei kann die Oberkante der unteren Rückstauklappe als Anschlag für das freie Ende der oberen Rückstauklappe dienen. Die Anordnung von zwei Rückstauklappen übereinander hat sich bei den üblichen Abmessungen von Rückstauklappen als besonders zweckmäßig erwiesen, wobei die Breite derartiger Klappen etwa 1m bis 1,5 m, die Höhe etwa 50 cm bis 1 m beträgt. Dadurch, daß die einzelnen Klappen auch im voll ausgeschwenkten Zustand innerhalb des Rahmens bleiben sollen, ergibt sich aus der Länge der einzelnen Klappen die notwendige Tiefe des Rahmens.Two backflow flaps are expediently arranged one above the other and are articulated on the side walls of the frame. The upper edge of the lower backflow flap can serve as a stop for the free end of the upper backflow flap. The arrangement of two backflow flaps one above the other has proven particularly useful in the usual dimensions of backflow flaps, the width of such flaps being approximately 1 m to 1.5 m and the height approximately 50 cm to 1 m. The fact that the individual flaps should remain within the frame even in the fully pivoted state, the length of the individual flaps results in the necessary depth of the frame.

Für die Rückstauklappe wird zweckmäßigerweise als Material Metallblech, beispielsweise verzinktes Blech, oder Kunststoff wie Polypropylen verwendet.Metal sheet, for example galvanized sheet metal, or plastic such as polypropylene is expediently used as the material for the backflow flap.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Es zeigt:

  • Fig. 1 eine Ansicht auf die Rückstauklappe von hinten,
  • Fig. 2 eine Rückstauklappe gemäß Fig. 1 im Schnitt,
  • Fig. 3 eine Rückstauklappe von oben im Schnitt.
An embodiment of the invention is shown in the drawing. It shows:
  • 1 is a view of the backflow flap from behind,
  • 2 shows a backflow flap according to FIG. 1 in section,
  • Fig. 3 shows a backflow valve from above in section.

Die Rückstauklappe ist allgemein mit 1 bezeichnet. Sie weist einen rechteckigen Rahmen 2 auf. In diesem Rahmen 2 sind zwei übereinander angeordnete Klappen 3 und 4 angeordnet. Diese Klappen sind an den Seitenwänden 6 und 7 des Rahmens 2 angelenkt. Die Oberkante 9 der unteren Klappe 4 dient dabei gleichzeitig als Anschlag für das freie Ende der oberen Klappe 3. Für das freie Ende der unteren Klappe 4 dienen zwei im Inneren des Rahmens 2 vorgesehene Anschläge 8 als Anschlag.The backflow flap is generally designated 1. It has a rectangular frame 2. In this frame 2, two flaps 3 and 4 are arranged one above the other. These flaps are hinged to the side walls 6 and 7 of the frame 2. The upper edge 9 of the lower flap 4 also serves as a stop for the free end of the upper flap 3. For the free end of the lower flap 4 serve two stops 8 provided inside the frame 2 as a stop.

Die Strömungsrichtung durch die Rückstauklappe ist in Fig. 2 durch Pfeile angedeutet.The direction of flow through the backflow flap is indicated in FIG. 2 by arrows.

Claims (4)

Rückstauklappe (1) für rechteckige Entlüftungskanäle, insbesondere Verteilerkanäle oder Flachkanäle, gekennzeichnet durch a) einen rechteckigen Rahmen (2), dessen Außenflächen und Außenbegrenzungen zum Einschieben in die Entlüftungskanäle im wesentlichen eben ausgebildet sind, b) wenigstens eine Klappe (3, 4), die im Inneren des Rahmens (2) in der Nähe des Eintritts der Entlüftungsströmung angelenkt ist, und deren Höhe etwas geringer als die Tiefe des Rahmens (2) ist, c) Anschläge (8; 9) für das freie Ende der Klappe (3, 4), die ein Durchschwingen der Klappe entgegen der Entlüftungsströmung verhindern. Backflow flap (1) for rectangular ventilation channels, in particular distribution channels or flat channels, characterized by a) a rectangular frame (2), the outer surfaces and outer limits of which are essentially flat for insertion into the ventilation ducts, b) at least one flap (3, 4) which is articulated in the interior of the frame (2) in the vicinity of the inlet of the ventilation flow and whose height is slightly less than the depth of the frame (2), c) stops (8; 9) for the free end of the flap (3, 4), which prevent the flap from swinging against the ventilation flow. 2. Rückstauklappe nach Anspruch 1, dadurch gekennzeichnet , daß die untere Innenseite (5) des Rahmens (2) strömungsabwärts leicht nach unten geneigt ist.2. backflow flap according to claim 1, characterized in that the lower inside (5) of the frame (2) is inclined slightly downward downstream. 3. Rückstauklappe nach Anspruch 1 oder 2, dadurch gekennzeichnet , daß zwei Klappen (3, 4) übereinander angeordnet sind, die an den Seitenwänden (6, 7) des Rahmens (2) angelenkt sind, wobei die Oberkante (9) der unteren Rückstauklappe (4) als Anschlag für das freie Ende der oberen Rückstauklappe (3) dient.3. backflow flap according to claim 1 or 2, characterized in that two flaps (3, 4) are arranged one above the other, which are articulated on the side walls (6, 7) of the frame (2), the upper edge (9) of the lower backflow flap (4) serves as a stop for the free end of the upper backflow flap (3). 4. Rückstauklappe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet , daß als Material Metallblech oder vorzugsweise Kunststoff wie Polypropylen verwendet wird.4. backflow flap according to one of claims 1 to 3, characterized in that sheet metal or preferably plastic such as polypropylene is used as the material.
EP81103301A 1980-08-06 1981-05-02 Non-return valve for rectangular gas ducts Expired EP0045351B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8021092U 1980-08-06
DE19808021092U DE8021092U1 (en) 1980-08-06 1980-08-06 BACKFLOW VALVE FOR RECTANGULAR VENTILATION CHANNELS, IN PARTICULAR DISTRIBUTION CHANNELS OR FLAT CHANNELS

Publications (3)

Publication Number Publication Date
EP0045351A2 true EP0045351A2 (en) 1982-02-10
EP0045351A3 EP0045351A3 (en) 1982-03-31
EP0045351B1 EP0045351B1 (en) 1985-04-10

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ID=6717825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81103301A Expired EP0045351B1 (en) 1980-08-06 1981-05-02 Non-return valve for rectangular gas ducts

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EP (1) EP0045351B1 (en)
DE (2) DE8021092U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5360372A (en) * 1989-05-02 1994-11-01 Gpac, Inc. Control system for doors of a negative air pressure enclosure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1326204A (en) * 1970-08-22 1973-08-08 Bloxvich Lock Stamping Reigisters for ducted warm air heating systems
DE2901877A1 (en) * 1979-01-18 1980-07-31 Meissner & Wurst Automatic stop valve for gas main - has elastic hinging non return flap against downstream side of inserted frame
GB2041514A (en) * 1979-02-05 1980-09-10 Kiparski H A wall box assembly for connection to the end of a flat ventilation duct

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1326204A (en) * 1970-08-22 1973-08-08 Bloxvich Lock Stamping Reigisters for ducted warm air heating systems
DE2901877A1 (en) * 1979-01-18 1980-07-31 Meissner & Wurst Automatic stop valve for gas main - has elastic hinging non return flap against downstream side of inserted frame
GB2041514A (en) * 1979-02-05 1980-09-10 Kiparski H A wall box assembly for connection to the end of a flat ventilation duct

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5360372A (en) * 1989-05-02 1994-11-01 Gpac, Inc. Control system for doors of a negative air pressure enclosure

Also Published As

Publication number Publication date
DE3169791D1 (en) 1985-05-15
DE8021092U1 (en) 1980-11-06
EP0045351A3 (en) 1982-03-31
EP0045351B1 (en) 1985-04-10

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