File:Fancoil unit sl silicone firestop.jpg
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| Description | Firestop at a high-rise fan coil unit. High-rise fan coil units are devices in residential construction that can provide both heating and cooling inside an apartment or hotel room. They are located one above the other and all interconnected. Ordinarily, each fan coil unit requires a rectangular through-penetration in the concrete slab on top of which it sits. Usually, there are either 3 or 5 copper pipes that go through the floor. The pipes are usually insulated with refrigeration insulation, such as acrylonitrile butadiene/polyvinyl chloride (AB/PVC) flexible foam (Rubatex or Armaflex brands). If the firestop is a cheap soft seal, such as the one shown here, made of stuffed rockwool packing, the foamed pipe insulation cannot penetrate as it will disappear during the fire and hose stream test used to qualify the firestop. Instead, in this example, rockwool insulation with an ASJ ("All Service Jacket" = foil scrim kraft) was used within the firestop. Here, it is still necessary to provide a proper bond and continuous vapour barrier with the foamed insulation above, in order to prevent condensation damage of the finishes as well as to prevent a useless escape of energy. Were one to use firestop mortar as the firestop instead, such as in this example, then the original insulation could pass through that firestop, provided that an intumescent were used around the foamed pipe insulation to make sure that the rating of the firestop is maintained, such as in this example. The intumescent needs something to push against. Rockwoll packing, as in the case of this picture, would simply give way to the force of the expanding intumescent. The mortar/intumescent example is much superior to what is shown in this picture because the mortar provides better sound attenuation and a far better T rating (thermal transmission to the unexposed side in case of a fire) and also because joining the vapour barriers between the foamed plastic insulation, which is covalently bound, and the mineral insulation, which is ionically bound is problematic. At best, one can hope for a bond made of weak Van der Waals bonds, which is a poor judgment call on the part of the Consultant allowing this. The foamed plastic can achieve a DIN 4102 Part 1 B1 rating, and does well in the fire test on the unexposed side, as can be seen here, as long as there is a solid intumescent surrounding it at the point of penetration. |
| Date | |
| Source | Own work |
| Author | Achim Hering |
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 00:04, 3 December 2007 | | 4,574 × 3,157 (739 KB) | Achim Hering (talk | contribs) | {{Information |Description=Firestop at a high-rise fan coil unit. High-rise fan coil units are devices in residential construction that can provide both heating and cooling inside an apartment or hotel room. They are located one above the othe |
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