EP2365152A1 - Ceiling system with framework and panels and including means for creating ventilation gaps. - Google Patents

Ceiling system with framework and panels and including means for creating ventilation gaps. Download PDF

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Publication number
EP2365152A1
EP2365152A1 EP10155585A EP10155585A EP2365152A1 EP 2365152 A1 EP2365152 A1 EP 2365152A1 EP 10155585 A EP10155585 A EP 10155585A EP 10155585 A EP10155585 A EP 10155585A EP 2365152 A1 EP2365152 A1 EP 2365152A1
Authority
EP
European Patent Office
Prior art keywords
horizontal
vertical
gap
ceiling
ceiling system
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.)
Ceased
Application number
EP10155585A
Other languages
German (de)
French (fr)
Inventor
designation of the inventor has not yet been filed The
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.)
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Original Assignee
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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 Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO filed Critical Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Priority to EP10155585A priority Critical patent/EP2365152A1/en
Priority to PCT/NL2011/050150 priority patent/WO2011108928A1/en
Priority to EP11708346.9A priority patent/EP2542730B1/en
Publication of EP2365152A1 publication Critical patent/EP2365152A1/en
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
    • F24F13/072—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser of elongated shape, e.g. between ceiling panels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/06—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members
    • E04B9/065—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members comprising supporting beams having a folded cross-section
    • E04B9/067—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members comprising supporting beams having a folded cross-section with inverted T-shaped cross-section
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/22—Connection of slabs, panels, sheets or the like to the supporting construction
    • E04B9/24—Connection of slabs, panels, sheets or the like to the supporting construction with the slabs, panels, sheets or the like positioned on the upperside of, or held against the underside of the horizontal flanges of the supporting construction or accessory means connected thereto
    • E04B9/241—Connection of slabs, panels, sheets or the like to the supporting construction with the slabs, panels, sheets or the like positioned on the upperside of, or held against the underside of the horizontal flanges of the supporting construction or accessory means connected thereto with the slabs, panels, sheets or the like positioned on the upperside of the horizontal flanges of the supporting construction
    • E04B9/244—Connection of slabs, panels, sheets or the like to the supporting construction with the slabs, panels, sheets or the like positioned on the upperside of, or held against the underside of the horizontal flanges of the supporting construction or accessory means connected thereto with the slabs, panels, sheets or the like positioned on the upperside of the horizontal flanges of the supporting construction comprising sealing means between the supporting construction and the slabs, panels, sheets or the like

Definitions

  • the present invention refers to a ceiling system comprising a plurality of ceiling panels and a ceiling framework for supporting those panels.
  • the invention refers to a so-called dropped ceiling system, i.e. a lowered (secondary) ceiling, hung below mainly parallel to the main (structural) ceiling. They may also be referred to as a drop ceiling, false ceiling, or suspended ceiling.
  • the area above the dropped ceiling is called the plenum space, as it is sometimes used for HVAC air return.
  • the plenum space is also very commonly used to conceal piping, wiring, and/or ductwork.
  • a typical dropped ceiling consists of a grid-work of metal channels in the shape of an upside-down "T", suspended on wires from the overhead structure. These channels snap together in a regularly spaced pattern - typically a 2x2 or 2x4 foot grid in the US, or 600x600 mm grid in Europe. Each cell is filled with lightweight "tiles” or “panels” which simply drop into the grid.
  • Tiles can be selected with a variety of materials, including wood, metal, plastic, or mineral fibers, and can come in almost any color. Light fixtures, HVAC air grilles, and other fixtures are available which can fit the same space as a tile for easy installation. Most tile material is easily cut to allow fixtures in other shapes, such as incandescent lights, speakers, and fire sprinkler heads.
  • An earlier patent application WO2009005344 of applicant discloses a ventilation method and system respectively for ventilating rooms like classrooms and the like, comprising a surface structure mainly extending parallel to the ceiling, and means for forced air inlet from the outside air into the room between said surface structure and the ceiling.
  • Air outlet openings are provided, which are mainly evenly spaced over the whole surface of the surface structure.
  • the hydraulic diameter of the outlet openings is between 0.1 and 6 cm.
  • the means for forced air inlet from the outside air into the room (or plenum space) between the surface structure and said wall, ceiling or floor are formed by an electrical ventilator.
  • the panels concerned are provided with holes which can be made during the manufacturing process of the panels or -e.g. when already installed panels are used- by drilling. Disadvantageous is that
  • One aim of the present invention is to provide a system which e.g. is arranged to perform a method as presented in W02009005344 , however without the obligation to provide -during or after their manufacture- the relevant panels with holes.
  • Another aim of the present invention is to provide means by which standard panels can be used, even if already installed in an existing ceiling system.
  • a ceiling system comprising a plurality of ceiling panels and a ceiling framework for supporting those panels, said framework including panel support profiles each including a vertical portion and a horizontal portion, which ceiling system, preferably, comprises spacing means arranged to create, per panel concerned, a vertical gap between relevant vertical portions of the profiles and at least one of the side edges of the panel, as well as a horizontal gap between relevant horizontal portions of the profiles and the horizontal lower surface of the panel.
  • spacing means for creating a vertical gap between the vertical portions of the profiles and the side edges of the panel, as well as a horizontal gap the horizontal portions of the profiles and the horizontal lower surface of the panel the panels don't need to be provided with ventilation holes.
  • standard panels can be used, even if already installed in an existing ceiling system.
  • the ventilation gaps can be obtained by insertion of the spacing means between the panels concerned and the surrounding portions of the support frame.
  • the spacing means comprise an elongated part, extending, in use, mainly parallel to said vertical gap and horizontal gap and interconnecting a series of spacing elements extending in said vertical gap and horizontal gap.
  • the ceiling system preferably, is arranged to be used in a ventilation system wherein an overpressure is provided at the top side relative to the lower side of the ceiling, causing a ventilation stream to flow from the top side to the lower side of the ceiling via said vertical and horizontal gaps.
  • the elongated part is, preferably, arranged to deflect said ventilation stream, after having passed said horizontal gap, into a downward direction.
  • the elongated part includes a mainly vertical wall, located opposite to the location of the vertical gap.
  • Figure 1 shows a prior art ceiling system including ceiling panels 1 and a ceiling framework including support profiles 2 with vertical portions 3 and horizontal portions 4.
  • the framework is hung below mainly parallel to the main (structural) ceiling by means of hooks 5.
  • Figure 2 shows the ceiling system of figure 1 including spacing means 6 arranged to create a vertical gap and a horizontal gap between the profiles 2 and the panel 1, forming a continuous gap between the upper side and the lower side of the panel, having a vertical and a horizontal part.
  • Figure 3 shows, as a preferred embodiment of the spacing means 6, an elongated part 7 interconnecting a series of spacing elements 8 which are intended to be mounted between the profiles 2 and the panel 1.
  • the spacing elements 8 each consist of a vertical spacer 9 for spacing the side edge of the panel from the vertical profile surface, as well as a horizontal spacer 10 for spacing the lower surface of the panel from the upper surface of the horizontal portion of the support profile.
  • the spacers 9 and 10 are interconnected by an interconnection part 11 which extends further to a side protrusion 12 provided on the elongated part 7.
  • the elongated part 7 has the shape of a vertical wall which is arranged to deflect a ventilation stream, caused by overpressure at the upper side of the panels, passing the vertical and horizontal gaps between the panel and the vertical and horizontal profile portions, into downward direction, away from the lower horizontal) surface of the panel.
  • the protrusion 12 functions as a (redundant) vertical spacer between the edge of the horizontal portion of the support profile and the deflection surface 13 of the elongated part 7.
  • Figure 4 shows the elongated part 7 of the spacing means 6, shown in figure 3 , wherein the spacing elements 8 have been installed between the (right) surface of the vertical part 3 and the upper surface of the horizontal part 4 of the support profile 2 and the (left) vertical side surface and the lower surface of the panel 1, wherein the elongated part 7 includes a vertical wall which is arranged to deflect the last part of a ventilation stream, originating from the plenum space above the panels and indicated by the arrows 13, 14 and 15, into downward direction, via a gap between said deflection wall/elongated part 7 and the side edge of the horizontal part 4 of the support profile 2.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Building Environments (AREA)

Abstract

Ceiling system comprising a plurality of ceiling panels (1) and a ceiling framework for supporting those panels, the framework including panel support profiles (2) each including a vertical portion (3) and a horizontal portion (4), the ceiling system, moreover, comprising spacing means (6) arranged to create, per panel concerned, a vertical gap between relevant vertical portions of the profiles and at least one of the side edges of the panel, as well as a horizontal gap between relevant horizontal portions of the profiles and the horizontal lower surface of the panel. The spacing means may comprise an elongated part (7), in use extending mainly parallel to the vertical gap and horizontal gap and interconnecting a series of spacing elements (8) extending in the vertical gap and horizontal gap. The ceiling system may be arranged to be used in a ventilation system wherein an overpressure is provided at the top side relative to the lower side of the ceiling system, causing a ventilation stream (13-15) to flow from the top side to the lower side of the ceiling system via the vertical and horizontal gaps. The elongated part (7) may be arranged to deflect the ventilation stream, after having passed the horizontal gap, into a downward direction (15).

Description

  • The present invention refers to a ceiling system comprising a plurality of ceiling panels and a ceiling framework for supporting those panels.
  • In particular, however not exclusively, the invention refers to a so-called dropped ceiling system, i.e. a lowered (secondary) ceiling, hung below mainly parallel to the main (structural) ceiling. They may also be referred to as a drop ceiling, false ceiling, or suspended ceiling. The area above the dropped ceiling is called the plenum space, as it is sometimes used for HVAC air return. The plenum space is also very commonly used to conceal piping, wiring, and/or ductwork.
  • A typical dropped ceiling consists of a grid-work of metal channels in the shape of an upside-down "T", suspended on wires from the overhead structure. These channels snap together in a regularly spaced pattern - typically a 2x2 or 2x4 foot grid in the US, or 600x600 mm grid in Europe. Each cell is filled with lightweight "tiles" or "panels" which simply drop into the grid. Tiles can be selected with a variety of materials, including wood, metal, plastic, or mineral fibers, and can come in almost any color. Light fixtures, HVAC air grilles, and other fixtures are available which can fit the same space as a tile for easy installation. Most tile material is easily cut to allow fixtures in other shapes, such as incandescent lights, speakers, and fire sprinkler heads.
  • An earlier patent application WO2009005344 of applicant discloses a ventilation method and system respectively for ventilating rooms like classrooms and the like, comprising a surface structure mainly extending parallel to the ceiling, and means for forced air inlet from the outside air into the room between said surface structure and the ceiling. Air outlet openings are provided, which are mainly evenly spaced over the whole surface of the surface structure. Preferably, the hydraulic diameter of the outlet openings is between 0.1 and 6 cm. The means for forced air inlet from the outside air into the room (or plenum space) between the surface structure and said wall, ceiling or floor are formed by an electrical ventilator.
  • In the embodiments shown in WO2009005344 the panels concerned are provided with holes which can be made during the manufacturing process of the panels or -e.g. when already installed panels are used- by drilling. Disadvantageous is that
    • the holes have to be made, either during production or afterwards;
    • panels with and without holes should be held in stock separately;
    • the (plurality of) holes in the ceiling panels are considered to be not aesthetical.
  • One aim of the present invention is to provide a system which e.g. is arranged to perform a method as presented in W02009005344 , however without the obligation to provide -during or after their manufacture- the relevant panels with holes.
  • Another aim of the present invention is to provide means by which standard panels can be used, even if already installed in an existing ceiling system.
  • According to the invention a ceiling system is provided comprising a plurality of ceiling panels and a ceiling framework for supporting those panels, said framework including panel support profiles each including a vertical portion and a horizontal portion, which ceiling system, preferably, comprises spacing means arranged to create, per panel concerned, a vertical gap between relevant vertical portions of the profiles and at least one of the side edges of the panel, as well as a horizontal gap between relevant horizontal portions of the profiles and the horizontal lower surface of the panel.
  • By using spacing means for creating a vertical gap between the vertical portions of the profiles and the side edges of the panel, as well as a horizontal gap the horizontal portions of the profiles and the horizontal lower surface of the panel the panels don't need to be provided with ventilation holes. Moreover, standard panels can be used, even if already installed in an existing ceiling system. The ventilation gaps can be obtained by insertion of the spacing means between the panels concerned and the surrounding portions of the support frame.
  • Preferably, the spacing means comprise an elongated part, extending, in use, mainly parallel to said vertical gap and horizontal gap and interconnecting a series of spacing elements extending in said vertical gap and horizontal gap.
  • The ceiling system, preferably, is arranged to be used in a ventilation system wherein an overpressure is provided at the top side relative to the lower side of the ceiling, causing a ventilation stream to flow from the top side to the lower side of the ceiling via said vertical and horizontal gaps. To cause that the ventilation air mixes well with the below air mass in the room to be ventilated, the elongated part is, preferably, arranged to deflect said ventilation stream, after having passed said horizontal gap, into a downward direction. Preferably, the elongated part includes a mainly vertical wall, located opposite to the location of the vertical gap.
  • Hereinafter the invention will be elucidated with reference to some figures.
    • Figure 1
    shows a prior art ceiling system including ceiling panels and a ceiling framework including support profiles with vertical and horizontal portions.
    Figure 2
    shows the ceiling system of figure 1, however, including spacing means arranged to create a vertical gap and a horizontal gap between the profiles and the panel.
    Figure 3
    shows an elongated part interconnecting a series of spacing elements intended to extend in a vertical gap and horizontal gap between the profiles and the panel.
    Figure 4
    shows the elongated part shown in figure 3 wherein the spacing elements have been installed between parts of the profile and panel, wherein the elongated part includes a vertical wall arranged to deflect a ventilation stream into downward direction.
  • Figure 1 shows a prior art ceiling system including ceiling panels 1 and a ceiling framework including support profiles 2 with vertical portions 3 and horizontal portions 4. The framework is hung below mainly parallel to the main (structural) ceiling by means of hooks 5.
  • Figure 2 shows the ceiling system of figure 1 including spacing means 6 arranged to create a vertical gap and a horizontal gap between the profiles 2 and the panel 1, forming a continuous gap between the upper side and the lower side of the panel, having a vertical and a horizontal part.
  • Figure 3 shows, as a preferred embodiment of the spacing means 6, an elongated part 7 interconnecting a series of spacing elements 8 which are intended to be mounted between the profiles 2 and the panel 1. Normally, four of such elongated part 7, having a length equal to about the length or width of the panel, will be mounted per panel, thus creating a mainly continuous gap surrounding that panel. The spacing elements 8 each consist of a vertical spacer 9 for spacing the side edge of the panel from the vertical profile surface, as well as a horizontal spacer 10 for spacing the lower surface of the panel from the upper surface of the horizontal portion of the support profile. The spacers 9 and 10 are interconnected by an interconnection part 11 which extends further to a side protrusion 12 provided on the elongated part 7. The elongated part 7 has the shape of a vertical wall which is arranged to deflect a ventilation stream, caused by overpressure at the upper side of the panels, passing the vertical and horizontal gaps between the panel and the vertical and horizontal profile portions, into downward direction, away from the lower horizontal) surface of the panel. The protrusion 12 functions as a (redundant) vertical spacer between the edge of the horizontal portion of the support profile and the deflection surface 13 of the elongated part 7.
  • Figure 4 shows the elongated part 7 of the spacing means 6, shown in figure 3, wherein the spacing elements 8 have been installed between the (right) surface of the vertical part 3 and the upper surface of the horizontal part 4 of the support profile 2 and the (left) vertical side surface and the lower surface of the panel 1, wherein the elongated part 7 includes a vertical wall which is arranged to deflect the last part of a ventilation stream, originating from the plenum space above the panels and indicated by the arrows 13, 14 and 15, into downward direction, via a gap between said deflection wall/elongated part 7 and the side edge of the horizontal part 4 of the support profile 2.

Claims (5)

  1. Ceiling system comprising a plurality of ceiling panels (1) and a ceiling framework for supporting those panels, said framework including panel support profiles (2) each including a vertical portion (3) and a horizontal portion (4), the ceiling system, moreover, comprising spacing means (6) arranged to create, per panel concerned, a vertical gap between relevant vertical portions of the profiles and at least one of the side edges of the panel, as well as a horizontal gap between relevant horizontal portions of the profiles and the horizontal lower surface of the panel.
  2. Ceiling system according to claim 1, said spacing means comprising an elongated part (7), in use extending mainly parallel to said vertical gap and horizontal gap and interconnecting a series of spacing elements (8) extending in said vertical gap and horizontal gap.
  3. Ceiling system according to claim 1 or 2, arranged to be used in a ventilation system wherein an overpressure is provided at the top side relative to the lower side of the ceiling system, causing a ventilation stream (13-15) to flow from the top side to the lower side of the ceiling system via said vertical and horizontal gaps.
  4. Ceiling system according to claim 2 and 3, wherein said elongated part (7) is arranged to deflect said ventilation stream, after having passed said horizontal gap, into a downward direction (15).
  5. Ceiling system according to claim 4, wherein said elongated part includes a mainly vertical wall (7) located opposite to the location of said vertical gap.
EP10155585A 2010-03-05 2010-03-05 Ceiling system with framework and panels and including means for creating ventilation gaps. Ceased EP2365152A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP10155585A EP2365152A1 (en) 2010-03-05 2010-03-05 Ceiling system with framework and panels and including means for creating ventilation gaps.
PCT/NL2011/050150 WO2011108928A1 (en) 2010-03-05 2011-03-04 Ceiling system and method for installing or modifying such a system
EP11708346.9A EP2542730B1 (en) 2010-03-05 2011-03-04 Ceiling system and method for installing or modifying such a system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10155585A EP2365152A1 (en) 2010-03-05 2010-03-05 Ceiling system with framework and panels and including means for creating ventilation gaps.

Publications (1)

Publication Number Publication Date
EP2365152A1 true EP2365152A1 (en) 2011-09-14

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EP10155585A Ceased EP2365152A1 (en) 2010-03-05 2010-03-05 Ceiling system with framework and panels and including means for creating ventilation gaps.
EP11708346.9A Not-in-force EP2542730B1 (en) 2010-03-05 2011-03-04 Ceiling system and method for installing or modifying such a system

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11708346.9A Not-in-force EP2542730B1 (en) 2010-03-05 2011-03-04 Ceiling system and method for installing or modifying such a system

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EP (2) EP2365152A1 (en)
WO (1) WO2011108928A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110700475A (en) * 2019-09-18 2020-01-17 上海金茂建筑装饰有限公司 Assembled ceiling suspended top beam structure and assembling method thereof
EP3879044A1 (en) * 2020-03-13 2021-09-15 Saint-Gobain Ecophon AB Ceiling tile and suspended ceiling system comprising such a ceiling tile
EP4246049A1 (en) * 2022-03-14 2023-09-20 Saint-Gobain Ecophon AB A diffuse ceiling ventilation system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108951990B (en) * 2018-08-14 2024-05-07 和能人居科技集团股份有限公司 Assembled furred ceiling

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3207057A (en) * 1962-09-07 1965-09-21 Donn Prod Inc Panel supporting grid
US3429250A (en) * 1962-04-17 1969-02-25 Wood Conversion Co Ventilating ceiling construction
US3475869A (en) * 1966-09-07 1969-11-04 Chicago Metallic Sash Co Ventilated suspended ceiling structure
US4611444A (en) * 1985-02-28 1986-09-16 Simplex Ceiling Corp. Sanitary acoustical ceiling
WO2009005344A2 (en) 2007-06-07 2009-01-08 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Ventilation system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429250A (en) * 1962-04-17 1969-02-25 Wood Conversion Co Ventilating ceiling construction
US3207057A (en) * 1962-09-07 1965-09-21 Donn Prod Inc Panel supporting grid
US3475869A (en) * 1966-09-07 1969-11-04 Chicago Metallic Sash Co Ventilated suspended ceiling structure
US4611444A (en) * 1985-02-28 1986-09-16 Simplex Ceiling Corp. Sanitary acoustical ceiling
WO2009005344A2 (en) 2007-06-07 2009-01-08 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Ventilation system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110700475A (en) * 2019-09-18 2020-01-17 上海金茂建筑装饰有限公司 Assembled ceiling suspended top beam structure and assembling method thereof
EP3879044A1 (en) * 2020-03-13 2021-09-15 Saint-Gobain Ecophon AB Ceiling tile and suspended ceiling system comprising such a ceiling tile
WO2021180644A1 (en) * 2020-03-13 2021-09-16 Saint-Gobain Ecophon Ab Ceiling tile and suspended ceiling system comprising such a ceiling tile
US20230111321A1 (en) * 2020-03-13 2023-04-13 Saint-Gobain Ecophon Ab Ceiling tile and suspended ceiling system comprising such a ceiling tile
EP4246049A1 (en) * 2022-03-14 2023-09-20 Saint-Gobain Ecophon AB A diffuse ceiling ventilation system
WO2023174787A1 (en) 2022-03-14 2023-09-21 Saint-Gobain Ecophon Ab A diffuse ceiling ventilation system

Also Published As

Publication number Publication date
WO2011108928A1 (en) 2011-09-09
EP2542730A1 (en) 2013-01-09
EP2542730B1 (en) 2013-12-11

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