Search

EP-4445057-B1 - A WALL THROUGH CONNECTION COMPRISING A DUCT PORTION AND A METHOD FOR MOUNTING A WALL THROUGH CONNECTION

EP4445057B1EP 4445057 B1EP4445057 B1EP 4445057B1EP-4445057-B1

Inventors

  • WALLIN, PETER
  • BERNHARDSSON, Göran
  • WALLIN, ANDREAS

Dates

Publication Date
20260513
Application Date
20221130

Claims (13)

  1. A wall through connection comprising a duct portion (1) having a fibre layer (2) and an inner layer (3) surrounding an elongated flow space (4), wherein - the fibre layer (2) comprises mineral fibres and a binder, compressed into a desired duct shape, the mineral fibres having a melting point over 800 degrees Celsius, and - the inner layer (3) is a steel foil having a thickness of at least 0,01 mm, facing the flow space (4), the wall through connection further comprising at least one of either a first set of sleeve couplings (6) or a second set of sleeve couplings (8), which are arranged on opposite sides of a wall (13) having a throughgoing hole (9) which shall receive the wall through connection, each first sleeve coupling (6) having a first flange (15), orthogonal to a length axis (14) along the elongated flow space (4), for connection to respective side of the wall (13), a rim portion (16) more or less parallel with the length axis (14), facing away from the wall when arranged, providing a radial stop for an expanding fire sealing material (7) provided in between an outer surface of the duct portion (1) and the rim portion (16) of the first sleeve coupling (6), and a second orthogonal flange (17) reaching from the rim portion (16) inwards to the outer surface of the duct portion (1), providing an axial stop for the fire expanding sealing material (7), each second sleeve coupling (8) has an orthogonal flange (19) and a sleeve (20) protruding into the throughgoing hole (9) covering up to half of the depth of the throughgoing hole in the wall, and expanding fire sealing material (21) is provided between the sleeve (20) of the second sleeve coupling (8) and the outer surface of the duct portion (1), and at least one stiffening means (10) is provided at the inner layer in line with the fire expandable sealing material.
  2. The wall through connection according to claim 1, wherein both a first sleeve coupling (6) and a second sleeve coupling (8) are provided on each side of the wall (13), wherein the second sleeve coupling (8) is attached between the first sleeve coupling (6) and the wall (13) on each side of the wall, the second flange (19) is positioned between the first flange (15) of the first sleeve coupling (6) and the side of the wall.
  3. The wall through connection according to claim 1, wherein two cuffs (23) provided one on each side of the wall (13) covering the sleeve coupling, the cuffs (23) are made of mineral fibres having a melting point over 800 degrees Celsius and a binder, compressed into a desired cuff shape.
  4. The wall through connection according to claim 1, wherein an outer layer (5) is provided on the outside of the fibre layer (2), the outer layer comprises an aluminium foil (8) and a polyethene layer (6) for attachment to the fibre layer.
  5. The wall through connection according to claim 1, wherein the steel foil is a stainless-steel foil.
  6. The wall through connection according to claim 1, wherein the fibre (2) layer is self-supported.
  7. The wall through connection according to claim 1, wherein the mineral fibre length is at least 10 mm, preferably at least 20 mm.
  8. The wall through connection according to claim 1, wherein the binder is phenolic based and water soluble.
  9. The wall through connection according to claim 1, wherein the ventilation duct (1) lacks binding material between the fibre layer (2) and the inner layer (3).
  10. The wall through connection according to claim 1, wherein the cross-sectional shape of the duct portion is more or less circular.
  11. A method of mounting a wall through connection comprising a duct portion (1) according to claim 1, comprising the steps: -bringing the duct portion (1) into a throughgoing hole (9) in a wall (13), mounting at least a first sleeve coupling (6) or a second sleeve coupling (8) on opposite sides of the wall (13) by either attaching a first orthogonal flange (15) to the side of the wall and positioning expanding fire sealing material (7) between a rim portion (16) of the first sleeve coupling and an outer surface of the duct portion (1) or by attaching an orthogonal flange (19) and positioning a sleeve (20) into the throughgoing hole covering up to half of the depth of the throughgoing hole in the wall (13), and positioning expanding fire sealing material (21) between the sleeve (20) of the second sleeve coupling (8) and the outer surface of the duct portion (1), and providing stiffening means (10, 11) at the inner layer (3), at least in line with the expanding fire sealing material.
  12. The method according to claim 11, wherein both a first sleeve coupling (6) and a second sleeve coupling (8) are provided on opposite sides of the wall (13), whereby the second sleeve coupling (8) is situated between the first sleeve coupling and the wall (13) on each side of the wall, the second sleeve coupling (8) having an orthogonal flange (19) positioned between the first flange (15) of the first sleeve coupling (6) and the side of the wall (13).
  13. The method according to claim 11, wherein two cuffs (23) are positioned, one on each side of the wall (13), covering the sleeve coupling, wherein the cuffs (23) are made of mineral fibres having a melting point over 800 degrees Celsius and a binder, compressed into a desired cuff shape.

Description

The present invention concerns a wall through connection for a ventilation duct system, where the wall through connection is capable of resisting high temperatures. Preferably, the whole ventilation duct system in which the wall through connection is a part of also withstands high temperatures. Document WO2021116411A1 discloses such wall through connection. There are classifications for the possibility of withstanding high temperatures for wall through connections. Our aim is to provide a wall through connection which when arranged in a through hole in a wall will fulfil at least fire class A2-s1-d0. For example, the wall through connection must not exceed an energy content (PSI value) of 3 MJ/kg in order not to add energy to a possible fire. At the moment both wall through connections and steel ducts are arranged in buildings, which thereafter are provided with mineral wool to insulate the ducts. The mineral wool is usually attached by means of chicken wire around the ducts and mineral wool. The aim is also to provide a pre-insulated wall through connection which will be both easily handled and lightweight. The ducts connected to the wall through connection may be standard ones present on the market, preferably fulfilling the European classification below. Most preferred is our ventilation duct system which will reach the market after the filing of the present application and which is presented in the still non-published patent applications 2151233-0, 2151234-8 and 2151235-5, comprising a fibre layer and an inner layer surrounding a flow space. The fibre layer comprises mineral fibres and a binder, compressed into a desired duct shape and the inner layer is a steel foil having a thickness of 0,01-0,3 mm, facing the flow space. The mineral fibres should have a melting point over 800 degrees Celsius. In the classifications for the possibility of withstanding high temperatures for ducts, the ducts transfer flue gas and must withstand temperatures between 900 and 1000 degrees Celsius for at least half an hour or at least an hour to fulfil a European classification EN1366 according to EI30/60. This will give people time to evacuate a burning building. According to this classification the cross section must be intact, and the outside temperature of the duct must not exceed 140 degrees Celsius in average and not over 180 degrees Celsius in one point. Summary of the invention According to a first aspect of the invention a wall through connection comprising a duct portion having a fibre layer and an inner layer surrounding an elongated flow space, wherein the fibre layer comprises mineral fibres and a binder, compressed into a desired duct shape, the mineral fibres having a melting point over 800 degrees Celsius, andthe inner layer is a steel foil having a thickness of at least 0,01 mm, facing the flow space. For example, the foil thickness could be 0,01-0,3 mm, preferably 0,01-0,2 mm and most preferred 0,03-0,1. At least one of either a first sleeve couplings or a second sleeve coupling are arranged on opposite sides of a wall having a throughgoing hole which shall receive the wall through connection. Each first sleeve coupling has a first flange, orthogonal to a length axis along the elongated flow space, for connection to respective side of the wall and a rim portion more or less parallel with the length axis, facing away from the wall when arranged. The rim portion provides a radial stop for an expanding fire sealing material which is provided in between an outer surface of the duct portion and the rim portion of the first sleeve coupling when arranged in the thronging hole. A second orthogonal flange reaches from the rim portion inwards to the outer surface of the duct portion providing an axial stop for the fire expanding sealing material. Each second sleeve coupling has an orthogonal flange and a sleeve protruding into the throughgoing hole covering up to half of the depth of the throughgoing hole in the wall when being in position in the throughgoing hole. Expanding fire sealing material is provided between the sleeve of the second sleeve coupling and the outer surface of the duct portion. This solution provides a sealed yet flexible wall through connection which easily may take up movements of a wall during a fire but still keep the wall through connection sealed so that no flue gases will leak from one room to another. Due to heat expansion walls may expand up to at least 50 mm. The wall through connection is pre-insulated, which minimises the need of separate transports and additional work at the installation place, and lightweight. Further, the wall through connection is also sound dampening. Obviously, the present invention may also be used through a floor/ceiling. According to some embodiments of the wall through connection, both a first sleeve coupling and a second sleeve coupling are provided on each side of the wall. The second sleeve coupling is preferably attached between the first sleeve couplin