Firestop device and installation thereof

Abstract

Penetration fire stop device (100) for penetration sealing of a hole in a building element, said fire stop device comprising an intumescent material and being provided with: • - a sleeve (10) for penetration through said hole in said building element, said sleeve is provided with an outer surface and an inner surface and has a length in an axial direction and a thickness between said inner surface and said outer surface in a radial direction, wherein said sleeve defines a channel at an interior of said inner surface; • - a flange (20) extending from said sleeve in a radial direction, • - a sealing member arranged to close said channel and • - a plurality of ribs (31) arranged at the outer surface of the sleeve, wherein the sleeve is provided with a groove (16) on its outer surface and extending in the axial direction.

Description

[0001] Firestop device and installation thereof

[0002] FIELD OF THE INVENTION

[0003] The invention relates to a penetration fire stop device for penetration sealing of a hole in a building element, said fire stop device comprising an intumescent material and being provided with:

[0004] - a sleeve for penetration through said hole in said building element, said sleeve is provided with an outer surface and an inner surface and has a length in an axial direction and a thickness between said inner surface and said outer surface in a radial direction, wherein said sleeve defines a channel at an interior of said inner surface;

[0005] - a flange extending from said sleeve in a radial direction,

[0006] - a sealing member arranged to close said channel and

[0007] - a plurality of ribs arranged at the outer surface of the sleeve.

[0008] The invention further relates to an installation method for installation of said penetration fire stop device to a building element such as a wall, floor or ceiling, wherein said sleeve extends into a hole of the building element and the flange rests on a front surface of said building element.

[0009] BACKGROUND OF THE INVENTION

[0010] Fire stop devices are important tools for prevention that a fire extends between a first and a second compartment in a building. Such fire stop devices work to close a hole in a building element such as a wall, ceiling or floor in the event of a fire. They further may work to prevent extension of smoke from a first into a second compartment. Such compartment may be a wall, a staircase, elevator shaft and even a ventilation shaft or a chimney. Thereto, many fire stop devices contain an intumescent material, which foams up at elevated temperature such as to fill any space in the hole. Whereas the space may originally have been filled with a pipe, a cable or anything else, such elements may melt or dissolve at the high temperatures occurring in case of fire.

[0011] Several types of fire stop device exists. A first type is arranged onto a front surface of the building element and will cover the hole in case of fire. An example herein is for instance a fire collar. A second type of fire stop device, herein also referred to as penetration fire stop devices, extends into and may even penetrate through the hole to the opposed side of the building element. It preferably comprises a flange and a sealing member in addition to a sleeve, as further specified in the opening paragraph. Such penetration fire stop devices are typically used for smaller holes and configured to fit around a single cable or a set of cables in the hole. A limitation of such penetration fire stop devices is that these are rather specific for a hole of a predefined diameter. If the diameter of the sleeve (diameter at the outer surface) exceeds the hole diameter, the sleeve does not fit. If the diameter of the sleeve is smaller, a gap remains and the device may not work properly in case of fire. Another limitation is that retrofitting of the fire stop device on existing holes with installed cables requires that the penetration fire stop device is cut through by a knife or industrial scissors. This reduces stability of the fire stop device and has an inherent risk of injuries.

[0012] SUMMARY OF THE INVENTION

[0013] It is therefore a first object to provide an improved penetration fire stop device of the type mentioned in the opening paragraph, which overcomes said limitations. It is a further object to provide an installation method for such penetration fire stop device.

[0014] According to a first aspect, the invention provides a penetration fire stop device for penetration sealing of a hole in a building element, said fire stop device comprising an intumescent material and being provided with:

[0015] - a sleeve for penetration through said hole in said building element, said sleeve is provided with an outer surface and an inner surface and has a length in an axial direction and a thickness between said inner surface and said outer surface in a radial direction, wherein said sleeve defines a channel at an interior of said inner surface;

[0016] - a flange extending from said sleeve in a radial direction,

[0017] - a sealing member arranged to close said channel and

[0018] - a plurality of ribs arranged at the outer surface of the sleeve, wherein the sleeve is provided with a groove on its outer surface and extending in the axial direction.

[0019] According to a second aspect, the invention provides use of the penetration fire stop device for creating a fire-resistant passage of a pipe or cable through a hole in a building element, wherein said pipe or cable has been pre-arranged through said hole, or can be arranged through the channel within the sleeve of the penetration fire stop device after or simultaneously with assembly of said penetration fire stop device into said hole.

[0020] According to a further aspect, the invention provides an installation method for such a penetration fire stop device into a hole of a building element, wherein a pipe or a cable has been pre-arranged through said hole, said method comprising the steps of:

[0021] Creating a slit into the fire stop device of the invention by opening the groove; Arranging the slitted fire stop device over a pipe or cable extending through the hole of the building element, and

[0022] Assembling the fire stop device to the building element, such that the sleeve extends into, and the hole and the flange rests on a front surface of the building element.

[0023] According to again a further aspect, the invention provides A method of creating a fire-resistant passage of a pipe or a cable through a hole in a building element such as a wall, floor or ceiling, said method comprising the steps of: providing a penetration fire stop device according to the invention; assembling the fire stop device to the building element, such that the sleeve of the fire stop device extends into the hole and its flange rests on a front surface of the building element; forming an aperture in the sealing member of said fire stop device, and arranging said pipe or cable through the channel within the penetration fire stop device and through the created aperture in the sealing member.

[0024] It has been found in investigations leading to the invention that the provision of a predefined zone of weakness by way of a groove facilitates flexibility during installation without reducing strength or stability of the device. This flexibility may be used to accommodate more than a single fire stop device into the building element hole of a larger diameter. Furthermore, when accommodating a pre-installed cable therein, the groove can be easily opened without damaging the entire fire stop device. This easy opening may be achieved with a common tool such as a knife or scissors. However, preferably, the easy opening is achieved manually without use of any tools. The design of the fire stop device may be optimized thereto, particularly by choice of dimensions.

[0025] According to a preferred embodiment, the groove extends into the flange. This type of groove is high beneficial to facilitate opening. While not strictly necessary, it is deemed beneficial in practice that the flange has a larger thickness than the sleeve, and hence may resist opening, particularly manual opening without use of any tools.

[0026] According to another preferred embodiment, the groove is a V-shaped groove. Such a groove has a first and a second oblique surface. It is not needed that these surfaces include the same angle to the outer surface of the sleeve. Preferably, such angle between said oblique surface and the outer surface is at most 60 degrees, or at most 45 degrees, and for instance at least 20 degrees, such as at least 30 degrees. In this way, the opening is highly facilitated. Moreover, after opening two edges remain that may extend over each other. This facilitates a proper installation and moreover allows installation of the fire stop device in a hole with a smaller diameter than the diameter of the outer surface of the sleeve.

[0027] In a further embodiment, the sleeve comprises an additional groove extending from the inner surface rather than from the outer surface. In this way, a grooved structure is formed with a shape in cross-section that corresponds to a double V-groove, a double U-groove or a combination of V- groove and U-groove. Such further embodiment may again facilitate the feature that the edges will overlap each other once that the fire stop device gets installed in the hole of the building element.

[0028] According to a further embodiment, the groove extends in the arial direction from a first end to a second end of the sleeve. Although it is not deemed necessary that the groove would extend along the entire outer surface of the sleeve, and preferably also along one entire surface of the flange, it is preferable.

[0029] According to another further embodiment, the groove extends in the axial direction from a first end at which it contacts the flange to a second point at a distance from an opposed second end of the sleeve. Herewith, an upper edge to the sleeve is created. Such upper edge provides additional resistance against premature opening if so needed. Rather than leaving out the groove entirely in such upper edge, the groove may have a reduced height as compared to its height in other areas of the sleeve.

[0030] Furthermore, said groove suitably has a depth, relative to the outer surface of the sleeve, that is less than the thickness of the sleeve. It is highly desired that the sleeve is not cut through during manufacturing. An annular sleeve, extending circumferential to the channel without any gap, is deemed preferable from manufacturing perspective. Particularly, according to a preferred manufacturing method, the penetration fire stop device is produced by means of insert moulding. The annular extension of the sleeve therein facilitates flow of material during the moulding process. Moreover, such annular sleeve has the advantage that it may be used as well in a form without splitting, for instance in case that the penetration fire stop device is installed into a hole in a building element before any cables or pipes are installed therein.

[0031] According to again a further embodiment, the groove is provided with a crack initiation point provided with a height, relative to the outer surface of the sleeve, that is different from the depth of the groove. When pressure is exerted on the sleeve, a pressure difference will arise between the protrusion and the groove. Owing thereto, a crack may be initiated, which will run along the groove in two opposed directions from the crack initiation point. In one embodiment, the crack initiation point constitutes a protrusion within the groove. More preferably, the protrusion has a top which encloses an apex angle of between 30 and 150 degrees. A first advantage of a protrusion with such a top, such as a chevron-notch structure, is that cracks initiated in different sleeves will be comparable and hence that the breaking stress is roughly the same in different sleeves. The crack may then run within the groove up to a barrier, such as a local deepening of a groove. The inventors have observed in investigations leading to the invention, that the sleeve material, being a polymer comprising an intumescent powder is sufficiently brittle at room temperature to enable such cracking.

[0032] According to another embodiment, a first slit is present in the sleeve, said first slit being arranged to overlap with said groove. Such a first slit runs through the sleeve, as opposed to said groove. Such a groove may facilitate opening of the groove, for instance with the help of a knife or scissors. In case that both a first and a second slit are present, this may facilitate the opening of the sleeve over a limited portion of the sleeve only.

[0033] According to an advantageous embodiment, said ribs extend parallel to the groove. Such parallel extension is deemed beneficial for assembly of the fire stop device into a hole of a building board, and especially into a hole of a gypsum building board. According to a proper installation, the building board would extend between the flange and the ribs. The ribs thus create clamping force for the penetration fire stop device on the gypsum-based building board. The penetration fire stop device according to this embodiment with parallel ribs may however also be used with advantage for other building boards, such as calcium-silicate based fire resistance boards, fiber cement boards and / or for stacks comprising one or more building boards and any further board, plate, device or the like.

[0034] Preferably, the number of ribs is at least four, preferably up to 12 such as 4 to 8, for instance 6. An even number of ribs is deemed preferable to achieve symmetry in the design. A semi-circular crosssection of the rib seems best.

[0035] According to a further embodiment, said sealing member and said flange are arranged in a single plane. This is deemed preferred for ease of handling by a user, and additionally is preferable from manufacturing perspective.

[0036] According to another further embodiment, the sealing member is provided on a first side with a plurality of protrusions. Such protrusions are deemed advantageous to stabilize the sealing member. Alternatively, the protrusions allow to reduce the thickness of the sealing member, and hence facilitate its opening without any tool, i.e. by making an aperture manually or even by way of pushing a tube or cable therethrough.

[0037] According to again a further embodiment, a coupling member extends from said flange in said radial direction of the sleeve, and wherein said coupling member is preferably provided with hole configured for a fastener. This further embodiment is advantageous to increase pull-out resistance of the penetration fire stop device. Such pull-out resistance is desired to prevent that the fire stop device gets out of the hole in a situation wherein a cable or pipe is pulled through the fire stop device or wherein a pulling or pushing force is exerted on a cable or pipe that has been installed into the channel within the penetration fire stop device

[0038] As mentioned hereinabove, the penetration fire stop device according to the invention may be installed into a hole of a building element either before or after that a cable or pipe has been arranged through said hole. Due to the groove in its sleeve, and preferably the flange too, the penetration fire stop device facilitates arrangement of the fire stop device around a pre-arranged cable or pipe. However, as the groove is not pre-opened, the fire stop device is sufficiently stable and robust for insertion into the hole as such, without opening the groove.

[0039] It is observed for sake of clarity that the penetration fire stop device is typically used for a single cable of for instance 10-30 mm, such as 15-25 mm. However, the use for a plurality of cables, which may be each of smaller diameter, and / or the use of pipes, alternatively referred to as tubes of a diameter adequate in view of the diameter of the hole through the building element is certainly not excluded.

[0040] In an advantageous embodiment, which may be applied both in case of pre-arranging the cable or pipe and in case of post-arranging the cable or pipe, the sleeve is opened to form a slit throughout is axial direction, and the sleeve is thereafter arranged into the hole, so that at least a portion of the outer surface of the sleeve extends along an inner surface of the hole. The relevant portion of the outer surface is particularly the portion between the flange and the ribs. With the term 'extends along', an arrangement is specified wherein the said outer surface of the sleeve and the inner surface of the hole are in contact with each other, at least over a major portion. Hence, by opening the slit, the penetration fire protection device may be used in a hole of a diameter that deviates from the (outer) diameter of the sleeve. This outer diameter is the diameter without taking account of the ribs on the outer surface of the sleeve. In one further embodiment, the hole diameter is smaller than the outer diameter of the sleeve. In such case, opposed edges of the slitted sleeve (i.e. the side edges formed by opening of the groove into a slit) may overlap.

[0041] In another further embodiment, the hole diameter is larger than the outer diameter of the sleeve. In such a case, a gap may remain. This is not necessarily problematic for the fire resistance, as the amount of intumescent material may still be sufficient to close the hole in case of fire or temperature rise. However, as a further option, the hole may be filled up by means of a first and a second penetration fire protection device. The slitted sleeves will thereto be bent out along a bending line in the remainder of the sleeve, typically opposite to the location of the groove / slit. As will be understood, the sleeves of said slitted and bent out fire protection devices may overlap. It is not excluded that in individual case a full (i.e. bent out) sleeve may be combined with a half sleeve, to arrive at any adequate filling of the hole.

[0042] The fire protection device of the present invention comprises an intumescent material. Such intumescent material is typically provided, for instance in powdered form, as part of an intumescent composition further comprising a binder polymer material. Examples of intumescent materials include graphite, such as expandable graphite, vermiculite and sodium silicate. Expandable graphite is preferred. Preferably, the particle size of the intumescent material is in the range of 0.20-0.60 mm, more preferably 0.3-0.5 mm, as defined by sieving. This is a comparatively fine size, which is deemed to lead to an improved, more homogeneous distribution of the intumescent material, i.e. through the fire stop device.

[0043] Representative examples of binder polymers for use in the intumescent composition (C) in the method of the present invention include, but are not limited to polyolefins, polylactic acid (PLA), polycaprolactone (PCL), acrylonitrile butadiene styrene (ABS), polyethylene terephthalate (PET), polyethylene trimethylene terephthalate (PETT), polyvinyl alcohol (PVA), polyamide (PA) or nylon, ethylene-vinyl acetate (EVA) copolymers, ethylene-butyl acrylate copolymers (EBA), polyvinyl chloride (PVC), acrylic polymers or copolymers, metallocene polymers, polyphthalamide (PPA), polystyrene (PS), high impact polystyrene (HIPS), silicone rubbers or polymers, latexes, styrene- ethylene-butylene-styrene (SEBS) or other thermoplastic elastomers (TPE), polycarbonate (PC), polyimides, polyetherimide (PEI), polyethersulfone (PES), polysulfone (PSU), polyphenylene oxide (PPO), polyphenylene ether (PPE), polyphenylene ether sulfone (PPSU), styrene-acrylonitrile (SAN), or silicone polycarbonate copolymers, or a mixture of two or more thereof, for instance as a blend. Step-growth polymers are deemed preferable over condensation growth polymers. Polyolefins such as polyethylene, such as LDPE, are deemed preferred.

[0044] In one preferred embodiment, a further intumescent additive is present in the intumescent composition. Examples of such further intumescent additives include one or more of ammonium or amino compounds, such as, for example, ammonium poly-phosphate, ammonium dihydrogen phosphate, ethylene-diamine phosphate, ammonium pentaborate, melamine, dicyandiamide, full phosphoric esters with polyols, dipentaerythritol, pentaerythritol, sugar, dextran, starch, vermicular graphite, exfoliating graphite, expandable graphite, waterglass or sodium silicates, expanded mica, vermiculite, perlite, or mixtures of two or more thereof. Particularly, the further intumescent additive is a different material than the intumescent material specified hereinabove. The particle size of the further intumescent additive is preferably chosen in the range of 0.20-0.60 mm, more preferably 0.3-0.5 mm as defined by sieving.

[0045] In a further embodiment, the intumescent composition further comprises at least one of a filler, a fire retardant, a rheology additive and a processing aid. Typical fillers include, but are not limited to inorganic materials, such as calcium carbonate, calcium silicates, silica, magnesium carbonate, titanium oxide, aluminium compounds, such as oxide, phosphates, hydroxides, trihydrate, inorganic fibers, such as glass fibers, and a variety of minerals and the like, such as kaolin, diatomaceous earth, mica, bentonite and clay. Preferred fire retardants are inorganic fire retardants and may be chosen among the group of metal hydroxides such as aluminum trihydrate; melamine phosphate; ammonium polyphosphate (APP) and diguanidine phosphate. However, other fire retardants as known to the skilled person are not excluded. A variety of options for the fire retardant, rheology additives, processing aids and binder polymers is specified in WO2022 / 106698A1, which is included herein by reference.

[0046] Preferably, the fire stop device of the present invention is produced as a monolithic part, rather than that the sealing member is assembled to the sleeve after initial manfacture. However, alternative manufacturing techniques are not excluded. Also after initial manufacturing, the fire stop device may be provided with any coating if so desired.

[0047] It is observed for sake of completeness, that any of the embodiments discussed hereinabove and / or hereinafter with respect to one aspect of the invention is also applicable to another aspect of the invention, even if not specified explicitly. BRIEF INTRODUCTION OF THE FIGURES

[0048] These and other features of the invention will hereinafter be elucidated with reference to following figures, which are not drawn to scale and purely diagrammatical. Equal reference numerals in different figures refer to equal or corresponding parts. Herein:

[0049] Fig. 1 shows in a front perspective a first embodiment of the fire stop device of the invention;

[0050] Fig. 2 shows the first embodiment of the fire stop device from a top side;

[0051] Fig. 3 shows in a bird's eye perspective a second embodiment of the fire stop device of the invention;

[0052] Fig. 4 shows in a bird's eye perspective a third embodiment of the fire stop device of the invention;

[0053] Fig. 5 shows in a bird's eye perspective a fourth embodiment of the fire stop device of the invention.

[0054] DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS

[0055] Fig. 1 shows in a front perspective a first embodiment of the fire stop device 100 of the invention. Fig. 2 shows the same fire stop device 100 from a top side. The fire stop device 100 is provided with a sleeve 10, a flange 20, ribs 31 and a sealing member 40. The sleeve 10 is provided with an outer surface 11 and an inner surface 12. This inner surface 12 defines a channel 15, in which one or more cables - not shown - may be arranged. The sleeve 10 preferably has a diameter, as defined by its outer surface 11. Such a diameter may correspond to a hole in a wall, or may be smaller or larger, as will be discussed hereinafter. Such a hole may for instance be implemented as one or more plasterboards. Upon installation of the fire stop device 100 into such a hole, the flange 20 will be arranged to abut against a main surface of the wall. Typically, the sleeve 10 will extend entirely through the wall. Particularly, the sleeve 10 may have a wall area with a length in the axial direction A between the flange 20 and a bottom end of the rib 31. Said length of the wall area preferably corresponds to the wall thickness. For instance, in Europe, a typical thickness of a gypsum board is 10 mm, and hence said length would be 10 mm. In the United States, a typical thickness of a fire rated gypsum board is 16 mm. Hence, the length of the wall area would be 16 mm. Evidently, a tolerance of about 10% is feasible.

[0056] In the embodiment illustrated in Fig. 1 and Fig. 2, the fire stop device 100 is provided with a first and a second rib 31. Both ribs 31 are curved, so as to extend both in the axial direction A and along part of the circumference of the sleeve 10. As shown in Fig. 1, the rib 31 has a diameter which decreases from its bottom end 34 to its tip 35. This type of rib is deemed preferable for building elements composed of or comprising insulation material such as mineral wool.

[0057] As is best visible in Fig. 2, the fire stop device 100 is provided with a sealing member 40. In the illustrated embodiment, the sealing member 40 is provided with protrusions 41. The sealing member 40 has typically a reduced thickness as compared to the sleeve 10 or the flange 20. In case that a cable is laid within the channel 15 and through a wall, an aperture is to be made in such sealing member 40. In case that the fire stop device 100 is to be provided onto a hole in which one or more cables are present, both the sleeve 10 and the sealing member 40 need to be opened.

[0058] According to the invention, the sleeve 10 is provided with a groove 16 on its outer surface 11. The groove extends in the axial direction A of the sleeve 10, and particularly between a first end 13 and a second end 14 of the sleeve. However, such continuous extension does not appear strictly necessary. In the shown embodiment, the groove 16 further extends on the groove 20. While the sleeve could theoretically be provided with more than one groove 16, this is not considered helpful or desirous. Rather, a single groove 16 is deemed preferable. The groove 16 of the illustrated embodiment has in cross-sectional view a V-shaped form. Its depth is smaller than the thickness of the sleeve 10. In the illustrated embodiment, the depth of the groove 16 is between 25 and 95% of the thickness of the sleeve 10, for instance between 30 and 80%, such as between 40 and 60%..

[0059] The opening of the sleeve 10 through opening of the groove 16 facilitates several usages. First of all, by opening the groove 16, the fire stop device 100 may be arranged into a hole with a smaller diameter than the sleeve diameter (i.e. at the outer surface 11). Additionally, by opening the groove 16, one may close off holes with a larger diameter than the sleeve diameter. In this case, a first and a second fire stop devices would be applied into a single hole. Optionally, the second fire stop device may be cut into half. This enables that a single sleeved fire stop device 100 of the invention may be sufficient to accommodate a variety of hole sizes. Moreover, by opening the groove 16, the fire stop device 100 may be arranged in a hole in which one or more cables have been assembled earlier.

[0060] Fig. 3 shows a second embodiment of the fire stop device 100. This second embodiment differs from the first embodiment in the type of ribs 32. In the illustrated example of Fig. 2, the ribs 32 are straight and arranged in parallel to the groove 16. The ribs 32 are semi-circular. This is advantageous for manufacture. The number of ribs 32 is increased from two in the first embodiment to six. This type of rib 32 is deemed preferable for gypsum boards. Rather than being used for a single gypsum board, the fire stop device 100 may alternatively be used in a wall comprising a first and a second gypsum board, optionally with mineral wool insulation. In a specific implementation, a wall or ceiling is of the one-hour fire rated type. This classification is known per se to the skilled person in the art of passive fire protection and specifies a type of gypsum board that has passed a fire test during a period of 60 minutes. Typical ly, a single gypsum board is used in such one-hour fire rated walls or ceilings. In another implementation, the wall or ceiling is of the two-hour fire rated type. This type is typically implemented using a first and a second gypsum board, and optionally further insulation, of specific quality to withstand fire. In the embodiment wherein a first and a second gypsum board are present, it is deemed beneficial that a first and second penetration fire stop device 100 are present, each penetrating through a single board. Rather than the fire stop device with the ribs shown in Fig.

[0061] 3, the ribs shown in Fig. 1 or Fig. 5 may be used.

[0062] Fig. 4 shows a third embodiment of the fire stop device 100. This third embodiment differs from the second embodiment in the presence of a coupling member 25 that extends from the flange 20. The coupling member 25 is provided with a hole 26, into which a fastener can be applied so as to fix the fire stop device 100 to the wall . Herewith the pull out resistance can be increased significantly.

[0063] Fig. 5 shows a fourth embodiment of the fire stop device 100. This fourth embodiment differs from the second embodiment in the shape of the ribs. Again, six ribs 33 are present in this fourth embodiment, which extend in parallel to the groove 16. The tips 35 of the ribs 33 however do not stop at the second end 14 of the sleeve 10, but rather at a predefined distance from said second end 14, i.e. the edge. Furthermore, the height and the width of the ribs 33 is not constant, as in the second embodiment, but rather decreases, as in the first embodiment from the bottom end 34 towards the tip 35 of the ribs.

[0064] LIST OF REFERENCE NUMERALS

[0065] 10 sleeve

[0066] 11 outer surface

[0067] 12 inner surface

[0068] 13 first end of sleeve

[0069] 14 second end of sleeve

[0070] 15 channel

[0071] 16 groove

[0072] 20 flange

[0073] 25 coupling member

[0074] 26 hole for fastener

[0075] 31 rib

[0076] 32 rib

[0077] 33 rib

[0078] 34 bottom end of rib 31, 32, 33

[0079] 35 tip of rib 31, 32, 33

[0080] 40 sealing member

[0081] 41 protrusions on sealing member

[0082] 100 fire stop device

[0083] A axial direction of the sleeve 10

Claims

CLAIMS1. Penetration fire stop device for penetration sealing of a hole in a building element, said fire stop device comprising an intumescent material and being provided with:- a sleeve for penetration through said hole in said building element, said sleeve is provided with an outer surface and an inner surface and has a length in an axial direction and a thickness between said inner surface and said outer surface in a radial direction, wherein said sleeve defines a channel at an interior of said inner surface;- a flange extending from said sleeve in a radial direction,- a sealing member arranged to close said channel and- a plurality of ribs arranged at the outer surface of the sleeve, wherein the sleeve is provided with a groove on its outer surface and extending in the axial direction.

2. Penetration fire stop device as claimed in claim 1, wherein said groove extends into said flange.

3. Penetration fire stop device as claimed in claim 1 or 2, wherein said groove extends in the axial direction from a first end to a second end of the sleeve.

4. Penetration fire stop device as claimed in any of preceding claims, wherein said groove has a depth, relative to the outer surface of the sleeve, that is less than the thickness of the sleeve.

5. Penetration fire stop device as claimed in claim 4, wherein the groove is provided with a crack initiation point provided with a height, relative to the outer surface of the sleeve, that is different from the depth of the groove, and preferably constitutes a protrusion within said groove.

6. Penetration fire stop device as claimed in any of the preceding claims, wherein a first slit is present in the sleeve, said first slit being arranged to overlap with said groove.

7. Penetration fire stop device as claimed in any of the preceding claims, wherein said ribs extend parallel to the groove.

8. Penetration fire stop device as claimed in claim 7, wherein the number of ribs is at least four, preferably up to 12 such as 6 to 8.

9. Penetration fire stop device as claimed in claims 7 or 8, wherein the ribs have a semi-circular cross-section.

10. Penetration fire stop device as claimed in any of the preceding claims, wherein said sealing member and said flange are arranged in a single plane.

11. Penetration fire stop device as claimed in any of the preceding claims, wherein the sealing member is provided on a first side with a plurality of protrusions.

12. Penetration fire stop device as claimed in any of the preceding claims, wherein a coupling member extends from said flange in said radial direction of the sleeve, and wherein said coupling member is preferably provided with hole configured for a fastener.

13. Penetration fire stop device as claimed in any of the preceding claims, wherein said groove is V- shaped.

14. A method of installation of a penetration fire stop device in a hole in a building element such as a wall, floor or ceiling, wherein a pipe or a cable has been pre-arranged through said hole, said fire stop device comprising an intumescent material and being provided with a sleeve for penetration through said hole in said building element, said sleeve is provided with an outer surface and an inner surface and has a length in an axial direction and a thickness between said inner surface and said outer surface in a radial direction, wherein said sleeve defines a channel at an interior of said inner surface; which penetration fire stop device further comprises a flange extending from said sleeve in a radial direction, a sealing member arranged to close said channel and a plurality of ribs arranged at the outer surface of the sleeve, wherein the sleeve is provided with a groove on its outer surface and extending in the axial direction, said method comprising the steps of:Creating a slit into the fire stop device by opening the groove;Arranging the slitted fire stop device over said pre-arranged pipe or cable extending through the hole of the building element;Assembling the fire stop device to the building element, such that the sleeve extends into the hole and the flange rests on a front surface of the building element.

15. A method of creating a fire-resistant passage of a pipe or a cable through a hole in a building element such as a wall, floor or ceiling, , said method comprising the steps of:- providing a penetration fire stop device comprising an intumescent material, which fire stop device comprises a sleeve for penetration through said hole in said building element, said sleeve is provided with an outer surface and an inner surface and has a length in an axial direction and a thickness between said inner surface and said outer surface in a radial direction, wherein said sleeve defines a channel at an interior of said inner surface; which penetration fire stop device further comprises a flange extending from said sleeve in a radial direction, a sealing member arranged to close said channel and a plurality of ribs arranged at the outer surface of the sleeve, wherein the sleeve is provided with a groove on its outer surface and extending in the axial direction,- assembling the fire stop device to the building element, such that the sleeve of the fire stop device extends into the hole and its flange rest on a front surface of the building element;- forming an aperture in the sealing member of said fire stop device, and- arranging said pipe or cable through the channel within the penetration fire stop device and through the created aperture in the sealing member.

16. The method as claimed in claim 15, further comprising the steps of creating a slit into the fire stop device by opening its groove, and creating a crack through said sealing member, wherein said crack creation results in the formation of said aperture in the sealing member.

17. The method as claimed in claim 14 or 16, wherein said fire stop device is assembled into the hole in a manner that the outer surface of the sleeve extends along an inner surface of said hole.

18. The method as claimed in claim 17, wherein the sleeve of the fire stop device has a larger diameter than said hole, and the slitted sleeve is arranged in said hole in that edges of opposed side of the slit overlap.

19. The method as claimed in claim 18, wherein the sleeve of the fire stop device has a smaller diameter than said hole, and wherein a first and a second fire stop device are inserted into said hole, in that the slitted sleeves are opened and optionally overlap with each other.

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