WO2003073016A1 - Ventilation duct including sound dampning materials with different density and a valve - Google Patents

Ventilation duct including sound dampning materials with different density and a valve Download PDF

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Publication number
WO2003073016A1
WO2003073016A1 PCT/SE2003/000306 SE0300306W WO03073016A1 WO 2003073016 A1 WO2003073016 A1 WO 2003073016A1 SE 0300306 W SE0300306 W SE 0300306W WO 03073016 A1 WO03073016 A1 WO 03073016A1
Authority
WO
WIPO (PCT)
Prior art keywords
ventilation duct
sound absorption
absorption material
damper
casing
Prior art date
Application number
PCT/SE2003/000306
Other languages
French (fr)
Inventor
Paul Nordin
Sven-Inge Blank
Original Assignee
Vasab Vägg & Akustik System Ab
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 Vasab Vägg & Akustik System Ab filed Critical Vasab Vägg & Akustik System Ab
Priority to AU2003212731A priority Critical patent/AU2003212731A1/en
Publication of WO2003073016A1 publication Critical patent/WO2003073016A1/en

Links

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
    • F24F13/0263—Insulation for air ducts
    • 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
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • 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
    • F24F2013/242—Sound-absorbing material

Definitions

  • Ventilation duct including sound dampning materials with different density and a valve.
  • the present invention relates to a ventilation duct that comprises a casing that on its interior is covered with a sound absorption material .
  • a damper is provided inside the ventilation duct .
  • Ventilation ducts are previously known, said ducts on its interior being covered with a sound absorption material, usually an insulation material of rock wool or glass wool.
  • a sound absorption material usually an insulation material of rock wool or glass wool.
  • An example of such a ventilation duct is shown in US-A-3 , 980, 007 and from this ventilation duct the air is distributed further on to distribution chambers along the length of the ventilation duct.
  • a primary object of the present invention is to present a ventilation duct of the type defined above, where the sound absorption ability is essentially improved compared to known ventilation ducts.
  • Still an object of the present invention is to provide a proper sound absorption over the entire frequency area.
  • the ventilation duct is equipped with a damper it is a further object of the present invention to have an overall sound absorption during the passage of the damper, i.e. the increase in the sound level that the damper brings about is to an essential degree compensated by the effect of the sound absorption material .
  • At least the primary object of the present invention is realised by means of a ventilation duct that has been given the features of the adherent independent claim 1.
  • Pre erred embodiments of the invention are defined in the dependent claims.
  • Figure 1 shows a longitudinal section through a ventilation duct according to the present invention
  • Figure 2 shows a section along II-II in figure 1
  • Figure 3 shows a longitudinal section through a ventilation duct according to the present invention, said ventilation duct being equipped with a damper
  • Figure 4 shows a section along IV-IV in figure 3
  • Figure 5 shows a perspective view of the lid of the damper
  • Figure 6 shows a longitudinal section through a further embodiment of a ventilation duct according to the present invention, said ventilation duct being equipped with a damper
  • Figure 7 shows a section along VII-VII in figure 6
  • Figure 8 shows a section along VIII-VIII in figure 6.
  • the ventilation duct that is shown in figures 1 and 2 comprises a casing 1 that normally is manufactured of sheet metal.
  • the casing 1 has a rectangular cross section, see figure 2.
  • the casing 1 is equipped with sleeves 3 that in the disclosed embodiment has circular cross-section.
  • O-rings 5 are provided on the outer side of the sleeves 3, said O-rings 5 effecting a sealing when the sleeves 3 are received in connecting external sleeves.
  • Each of the sleeves 3 has an extension from its free end up to the line 7, i.e. the sleeves 3 connect to the casing 1 at the lines 7.
  • first layer 9 of sound absorption material is provided inside the rectangular casing 1 and inside said first layer 9 a second layer 10 of sound absorption material is provided.
  • the first layer 9 has a higher density than the second layer 10.
  • the first layer 9 may have a density in the interval 100-140 kg/m 3 and the second layer 10 may have a density in the interval 35-50 kg/m 3 .
  • the layers 9 and 10 constitute insulation in the shape of rock wool and glass wool .
  • the layers 9, 10 of sound absorption material are maintained in place by longitudinal corner profiles (not shown) and frames (not shown) provided at the transition to the sleeves 3 , said frames being transverse to the air flow direction.
  • the second layer 10 defines in the shown embodiment a rectangular cross section area, in which the air flows.
  • the inwardly facing second layer 10 is allotted type approval as regards cleansing accessibility, fibre relief and emission.
  • the ventilation duct shown in figures 1 and 2 functions in the following way.
  • sound walls When air enters the ventilation duct sound walls will penetrate into the second layer 10 that constitutes the surface layer inside the ventilation duct .
  • This layer is relatively porous since it consists of sound absorption material of relatively low density. Therefore, the sound waves may relatively easy penetrate this second layer 10 that will absorb the high frequent sound waves.
  • the sound waves reaches the first layer 9 that consists of a sound absorption material of a higher density than the sound absorption material in the second layer 10, the sound absorption material in the first layer 9 will absorb sound waves with lower frequence .
  • the ventilation duct shown in figures 3 and 4 corresponds in principle the ventilation duct shown in figures 1 and 2. For that reason the same reference numerals have been used in figure 3 as in figures 1 and 2 as regards the ventilation duct and the appurtenant components .
  • the layers of sound absorption material 9, 10 are attached to the inner side of the casing 1 in a corresponding way as for the embodiment according to figures 1 and 2.
  • a damper 20 is provided inside the casing 1 of the ventilation duct, said casing 1 on its inner side being covered with two layers 9, 10 of sound absorption material, in a corresponding way as for the ventilation duct according to figures 1 and 2.
  • the damper 20 that is included in the ventilation duct according to figures 3 and 4 comprises a lid 21 that has a shape corresponding to the cross sectional shape defined by the inner layer 10 of sound absorption material.
  • the lid 21 is pivotally journalled by means of a shaft 22 that is provided in connection with, preferably parallel to, an inner layer of a sound absorption material .
  • the reason for the location of the shaft 22 is that the damper 20 in open position exposes the major part of the flow area of the ventilation duct, this in principle being necessary to fulfil the demands of the ventilation duct to be cleanable.
  • the lid 21 of the damper comprises a reinforcement in the shape of a perforated sheet 23, preferably of metal.
  • a frame 25 is provided that supports sound absorption material 24 on both sides of the sheet 23.
  • sound absorption material of the same density is attached on both sides of the sheet 23.
  • FIG. 6-8 a further alternative embodiment of a ventilation duct according to the present invention is shown, said ventilation duct being equipped with a damper 120.
  • the ventilation duct according to figures 6-8 comprises an external casing 101 that has a rectangular cross section, see figures 7 and 8.
  • two layers of sound absorption material are provided, a first outer layer 109 adjoining the inner side of the casing 101.
  • a second, internal layer 110 of sound absorption material is provided, said second layer 110 in cross section having a shape that defines a circular air flow area.
  • this portion functions on principle in the same way as the ventilation ducts described above, said ventilation ducts being equipped with double internal layers of sound absorption material .
  • a second portion of the ventilation duct according to figures 6-8 only one layer 108 of a sound absorption material is provided on the inner side of the casing 101, this second portion having a widened cross section compared to the first portion.
  • this second portion has an internal rectangular cross section and the damper 120 is provided in this second portion.
  • the damper 120 has the same structural design as the damper 20 in the embodiment according to figures 3-5.
  • the damper 120 also functions in the corresponding way as regards sound generation and sound reduction.
  • the ventilation duct has a rectangular cross section.
  • a ventilation duct according to the present invention i.e. a duct having no damper, may have a circular cross-section in accordance with what is shown in figure 7.
  • the casing of the ventilation duct is at its inner side covered with two layers of sound absorption material .
  • two layers of sound absorption material are provided on the inner side of the casing.
  • the sound absorption material 24; 124 of the same density are attached to both sides of the sheet 23; 123.
  • sound absorption materials of different densities are attached to both sides of the sheet 23.
  • the design of the lid 21; 121 of the damper 20; 120 it is feasible within the scope of the present invention that for instance two layers of sound absorption material are attached to the same side of the sheet, the sound absorption material having the lower density is located first in the air flow direction.
  • the sheet metal included in the lid is solid, i.e. not perforated.
  • the lid has no sheet metal, i.e. that the layers of sound absorption material have a sufficient stiffness to be mounted in the frame of the lid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Duct Arrangements (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Pipe Accessories (AREA)

Abstract

The present invention relates to a ventilation duct that comprises a casing (1; 101) that on its interior is covered with a sound absorption material (9, 10; 109, 110). According to a preferred embodiment of the invention a damper (20; 120) is provided inside the ventilation duct. It is significant of the ventilation duct of the present invention that sound absorption material (9, 10; 109, 110), having at least two different densities, is provided inside the casing (1; 101), and that the sound absorption material (10; 110) having the lowest density defines an air flow area, said sound absorption material (10; 110) constituting the surface layer inside the ventilation duct.

Description

Ventilation duct including sound dampning materials with different density and a valve.
Technical Field of the Invention
The present invention relates to a ventilation duct that comprises a casing that on its interior is covered with a sound absorption material . According to a preferred embodiment of the invention a damper is provided inside the ventilation duct .
Prior Art
Ventilation ducts are previously known, said ducts on its interior being covered with a sound absorption material, usually an insulation material of rock wool or glass wool. An example of such a ventilation duct is shown in US-A-3 , 980, 007 and from this ventilation duct the air is distributed further on to distribution chambers along the length of the ventilation duct.
In case a damper is provided in the ventilation duct reference is made to US-A-5, 465 , 756 as an example of prior art . In this case the sound absorption is effected by means of perforated sound barriers that are provided in the area of the periphery of the damper.
Objects and Features of the Invention A primary object of the present invention is to present a ventilation duct of the type defined above, where the sound absorption ability is essentially improved compared to known ventilation ducts.
Still an object of the present invention is to provide a proper sound absorption over the entire frequency area.
At a preferred embodiment where the ventilation duct is equipped with a damper it is a further object of the present invention to have an overall sound absorption during the passage of the damper, i.e. the increase in the sound level that the damper brings about is to an essential degree compensated by the effect of the sound absorption material .
At least the primary object of the present invention is realised by means of a ventilation duct that has been given the features of the adherent independent claim 1. Pre erred embodiments of the invention are defined in the dependent claims.
Brief Description of the Drawings Below two embodiments of the invention will be described with reference to the accompanying drawings, where: Figure 1 shows a longitudinal section through a ventilation duct according to the present invention; Figure 2 shows a section along II-II in figure 1; Figure 3 shows a longitudinal section through a ventilation duct according to the present invention, said ventilation duct being equipped with a damper; Figure 4 shows a section along IV-IV in figure 3 ; Figure 5 shows a perspective view of the lid of the damper; Figure 6 shows a longitudinal section through a further embodiment of a ventilation duct according to the present invention, said ventilation duct being equipped with a damper; Figure 7 shows a section along VII-VII in figure 6; and Figure 8 shows a section along VIII-VIII in figure 6.
Detailed Description of Preferred Embodiments of the Invention
The ventilation duct that is shown in figures 1 and 2 comprises a casing 1 that normally is manufactured of sheet metal. In the disclosed embodiment the casing 1 has a rectangular cross section, see figure 2. At its ends the casing 1 is equipped with sleeves 3 that in the disclosed embodiment has circular cross-section. O-rings 5 are provided on the outer side of the sleeves 3, said O-rings 5 effecting a sealing when the sleeves 3 are received in connecting external sleeves. Each of the sleeves 3 has an extension from its free end up to the line 7, i.e. the sleeves 3 connect to the casing 1 at the lines 7.
Inside the rectangular casing 1 two layers 9 and 10 of sound absorption material are provided. Closest to the casing 1 a first layer 9 of sound absorption material is provided and inside said first layer 9 a second layer 10 of sound absorption material is provided. The first layer 9 has a higher density than the second layer 10. In exemplifying and non-restricting purpose it may be mentioned that the first layer 9 may have a density in the interval 100-140 kg/m3 and the second layer 10 may have a density in the interval 35-50 kg/m3. Preferably the layers 9 and 10 constitute insulation in the shape of rock wool and glass wool .
The layers 9, 10 of sound absorption material are maintained in place by longitudinal corner profiles (not shown) and frames (not shown) provided at the transition to the sleeves 3 , said frames being transverse to the air flow direction.
As is evident from figure 2 the second layer 10 defines in the shown embodiment a rectangular cross section area, in which the air flows. The inwardly facing second layer 10 is allotted type approval as regards cleansing accessibility, fibre relief and emission.
As is evident from figure 1 collars 11 of insulation are externally pushed on the sleeves 3, said insulation will not be in contact the air flow inside the ventilation duct.
The ventilation duct shown in figures 1 and 2 functions in the following way. When air enters the ventilation duct sound walls will penetrate into the second layer 10 that constitutes the surface layer inside the ventilation duct . This layer is relatively porous since it consists of sound absorption material of relatively low density. Therefore, the sound waves may relatively easy penetrate this second layer 10 that will absorb the high frequent sound waves. When the sound waves reaches the first layer 9 that consists of a sound absorption material of a higher density than the sound absorption material in the second layer 10, the sound absorption material in the first layer 9 will absorb sound waves with lower frequence .
The ventilation duct shown in figures 3 and 4 corresponds in principle the ventilation duct shown in figures 1 and 2. For that reason the same reference numerals have been used in figure 3 as in figures 1 and 2 as regards the ventilation duct and the appurtenant components . The layers of sound absorption material 9, 10 are attached to the inner side of the casing 1 in a corresponding way as for the embodiment according to figures 1 and 2. In the embodiment of the present invention, shown in figures 3 and 4, a damper 20 is provided inside the casing 1 of the ventilation duct, said casing 1 on its inner side being covered with two layers 9, 10 of sound absorption material, in a corresponding way as for the ventilation duct according to figures 1 and 2.
The damper 20 that is included in the ventilation duct according to figures 3 and 4 comprises a lid 21 that has a shape corresponding to the cross sectional shape defined by the inner layer 10 of sound absorption material. The lid 21 is pivotally journalled by means of a shaft 22 that is provided in connection with, preferably parallel to, an inner layer of a sound absorption material . The reason for the location of the shaft 22 is that the damper 20 in open position exposes the major part of the flow area of the ventilation duct, this in principle being necessary to fulfil the demands of the ventilation duct to be cleanable.
As is evident from figure 5 the lid 21 of the damper comprises a reinforcement in the shape of a perforated sheet 23, preferably of metal. Around this sheet a frame 25 is provided that supports sound absorption material 24 on both sides of the sheet 23. In the shown embodiment sound absorption material of the same density is attached on both sides of the sheet 23. When air bypasses the damper 20 sound is generated and said sound generation being dependent from the opening degree of the damper 20. Due to the sound absorption material 24 that is attached to the sheet 23 of the damper 20 a certain sound reduction is also effected when the air passes the damper 20. In this connection the perforated sheet 23 functions as a resonator, i.e. it reduces sound of low frequency.
In figures 6-8 a further alternative embodiment of a ventilation duct according to the present invention is shown, said ventilation duct being equipped with a damper 120. The ventilation duct according to figures 6-8 comprises an external casing 101 that has a rectangular cross section, see figures 7 and 8. In a first portion of the ventilation duct two layers of sound absorption material are provided, a first outer layer 109 adjoining the inner side of the casing 101. Inside the first layer 109 a second, internal layer 110 of sound absorption material is provided, said second layer 110 in cross section having a shape that defines a circular air flow area. As regards sound absorption this portion functions on principle in the same way as the ventilation ducts described above, said ventilation ducts being equipped with double internal layers of sound absorption material .
In a second portion of the ventilation duct according to figures 6-8 only one layer 108 of a sound absorption material is provided on the inner side of the casing 101, this second portion having a widened cross section compared to the first portion. As is evident from figure 8 this second portion has an internal rectangular cross section and the damper 120 is provided in this second portion. On principle the damper 120 has the same structural design as the damper 20 in the embodiment according to figures 3-5. The damper 120 also functions in the corresponding way as regards sound generation and sound reduction.
Feasible Modifications of the Invention
In the embodiment shown in figures 1 and 2 the ventilation duct has a rectangular cross section. Of course a ventilation duct according to the present invention, i.e. a duct having no damper, may have a circular cross-section in accordance with what is shown in figure 7.
In the embodiments described above of the present invention the casing of the ventilation duct is at its inner side covered with two layers of sound absorption material . However, within the scope of the invention it is also feasible that three or more layers of sound absorption material are provided on the inner side of the casing.
In the embodiments described above according to figures 3-5 and figures 6-7 respectively the sound absorption material 24; 124 of the same density are attached to both sides of the sheet 23; 123. However, within the scope of the present invention it is also feasible that sound absorption materials of different densities are attached to both sides of the sheet 23. As regards the design of the lid 21; 121 of the damper 20; 120 it is feasible within the scope of the present invention that for instance two layers of sound absorption material are attached to the same side of the sheet, the sound absorption material having the lower density is located first in the air flow direction.
Within the scope of the present invention it is also feasible that the sheet metal included in the lid is solid, i.e. not perforated. Within the scope of the present invention it is also feasible that the lid has no sheet metal, i.e. that the layers of sound absorption material have a sufficient stiffness to be mounted in the frame of the lid.

Claims

Claims
1. Ventilation duct that comprises a casing (1; 101) that on its interior is covered with a sound absorption material (9, 10; 109, 110) , c h a r a c t e r i z e d in that sound absorption material (9, 10; 109, 110), having at least two different densities, is provided inside the casing (1; 101), and that the sound absorption material (10; 110) having the lowest density defines an air flow area, said sound absorption material (10; 110) constituting the surface layer inside the ventilation duct.
2. Ventilation duct according to claim 1, c h a r a c t e r i z e d in that the sound absorption material is divided into at least two layers (9, 10) .
3. Ventilation duct according to claim 1 or 2 , c h a r a c t e r i z e d in that the sound absorption material having the lowest density defines a rectangular air flow area.
4. Ventilation duct according to claim 1 or 2, c h a r a c t e r i z e d in that the sound absorption material (110) having the lower density defines a circular air flow area .
5. Ventilation duct according to any of the previous claims, c h a r a c t e r i z e d in that a damper (20; 120) is provided inside the casing (1; 101) .
6. Ventilation duct according to any of the previous claims, c h a r a c t e r i z e d in that the damper (20; 120) comprises a sheet (23; 123), and that sound absorption material (24; 124) is attached on both sides of the sheet (23; 123) .
7. Ventilation duct according to claim 6, c h a r a c t e r i z e d in that the sheet (23; 123) is perforated.
8. Ventilation duct according to any of the previous claims, c h a r a c t e r i z e d in that the sound absorption material (10; 110) having the lower density has a density in the interval 35-50 kg/m3, and that the sound absorption material having the higher density (9; 109) has a density in the interval 100-140 kg/ m3.
PCT/SE2003/000306 2002-02-28 2003-02-25 Ventilation duct including sound dampning materials with different density and a valve WO2003073016A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003212731A AU2003212731A1 (en) 2002-02-28 2003-02-25 Ventilation duct including sound dampning materials with different density and a valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0200595-7 2002-02-28
SE0200595A SE525044C2 (en) 2002-02-28 2002-02-28 Ventilation duct comprising sound attenuating materials of different densities and dampers with perforated blade

Publications (1)

Publication Number Publication Date
WO2003073016A1 true WO2003073016A1 (en) 2003-09-04

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PCT/SE2003/000306 WO2003073016A1 (en) 2002-02-28 2003-02-25 Ventilation duct including sound dampning materials with different density and a valve

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AU (1) AU2003212731A1 (en)
SE (1) SE525044C2 (en)
WO (1) WO2003073016A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2876434A1 (en) * 2004-10-11 2006-04-14 Technofan Sa Gas flow duct sealing device for e.g. aircraft ventilation system, has shutter movable between two positions and including layer with sound attenuation property, fixed to support at one side of shutters
DE102007062827A1 (en) 2007-12-21 2009-06-25 Behr Gmbh & Co. Kg Sound-absorbing fluid channel with a flow guide
EP2306108A1 (en) * 2009-09-25 2011-04-06 Hans Östberg A ventilating arrangement
EP2211120A3 (en) * 2009-01-23 2014-09-17 Valeo Climate Control Corporation HVAC System including a noise-reducing feature background
WO2019058350A1 (en) * 2017-09-25 2019-03-28 York (Wuxi) Air Conditioning And Refrigeration Co., Ltd. Silencer for a heating, ventilation, and air conditioning system
EP2642215B1 (en) * 2012-03-19 2019-09-25 NuAire Limited Ventilation system with an acoustic damper
EP3614066A1 (en) * 2018-08-22 2020-02-26 Arup Ventures Limited Openable panel unit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB721860A (en) * 1952-11-11 1955-01-12 Bolt Beranek & Newman Improvements in sound-absorbers for use in fluid media
US3263771A (en) * 1964-05-21 1966-08-02 Seifert Kurt Sound absorbing pipe lining having packing with different densities
US4068736A (en) * 1975-04-14 1978-01-17 Tempmaster Corporation Method and device for reducing noise
DE4429045A1 (en) * 1994-08-16 1996-02-22 Missel Gmbh & Co E Insulation material
US5530213A (en) * 1993-05-17 1996-06-25 Ford Motor Company Sound-deadened motor vehicle exhaust manifold
SE516302C2 (en) * 1999-03-26 2001-12-17 Paroc Group Oy Ab Silencer insert for air or gas ducts

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB721860A (en) * 1952-11-11 1955-01-12 Bolt Beranek & Newman Improvements in sound-absorbers for use in fluid media
US3263771A (en) * 1964-05-21 1966-08-02 Seifert Kurt Sound absorbing pipe lining having packing with different densities
US4068736A (en) * 1975-04-14 1978-01-17 Tempmaster Corporation Method and device for reducing noise
US5530213A (en) * 1993-05-17 1996-06-25 Ford Motor Company Sound-deadened motor vehicle exhaust manifold
DE4429045A1 (en) * 1994-08-16 1996-02-22 Missel Gmbh & Co E Insulation material
SE516302C2 (en) * 1999-03-26 2001-12-17 Paroc Group Oy Ab Silencer insert for air or gas ducts

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2876434A1 (en) * 2004-10-11 2006-04-14 Technofan Sa Gas flow duct sealing device for e.g. aircraft ventilation system, has shutter movable between two positions and including layer with sound attenuation property, fixed to support at one side of shutters
DE102007062827A1 (en) 2007-12-21 2009-06-25 Behr Gmbh & Co. Kg Sound-absorbing fluid channel with a flow guide
WO2009083064A1 (en) * 2007-12-21 2009-07-09 Behr Gmbh & Co .Kg Sound-dampening fluid channel having a flow guide element
EP2211120A3 (en) * 2009-01-23 2014-09-17 Valeo Climate Control Corporation HVAC System including a noise-reducing feature background
EP2306108A1 (en) * 2009-09-25 2011-04-06 Hans Östberg A ventilating arrangement
EP2642215B1 (en) * 2012-03-19 2019-09-25 NuAire Limited Ventilation system with an acoustic damper
WO2019058350A1 (en) * 2017-09-25 2019-03-28 York (Wuxi) Air Conditioning And Refrigeration Co., Ltd. Silencer for a heating, ventilation, and air conditioning system
EP3614066A1 (en) * 2018-08-22 2020-02-26 Arup Ventures Limited Openable panel unit
EP3614067A1 (en) * 2018-08-22 2020-02-26 Arup Ventures Limited Openable panel unit
WO2020039196A1 (en) * 2018-08-22 2020-02-27 Arup Ventures Limited Openable panel unit

Also Published As

Publication number Publication date
SE525044C2 (en) 2004-11-16
AU2003212731A1 (en) 2003-09-09
SE0200595D0 (en) 2002-02-28
SE0200595L (en) 2003-08-29

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