File:Ul 3h smoke and fire damper 12.png
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English: 3h smoke and fire damper, qualified to UL555 by means of fire testing under negative pressure, enabling cool, unexposed side, laboratory air to be drawn into the furnace through any gaps inside or outside of the damper, thus cooling down the system while being tested. Firestopping or any sealing of listing-mandated gaps voids the listing. SMACNA white paper on the topic: https://www.smacna.org/docs/default-source/technical-resources/improperfiredamperinstallation.pdf?sfvrsn=d121fda5_2 This does not address the topic of smoke migration through the exterior damper gap. In fire testing, this is not apparent, because the furnace runs at negative pressure, which cools the product being tested. But when the fire damper perimeter, whether located in a floor or wall, is under positive pressure on one side, other countermeasures can be employed to restrict smoke migration to the protected area, or unexposed side, such as to safeguard egress routes and areas of refuge from smoke potentially migrating from engaged compartments. This picture is in a series of pictures, described on https://community.nfpa.org/thread/45924, complete with a video link in the comments, at the bottom.
Deutsch: Feuerschutzklappe gemäß UL555 Brandprüfung bei Unterdruck in der Brandkammer. Der Unterdruck führt dazu, dass kühle Laborluft, von der feuerabgewandten Seite, durch Lücken innerhalb und außerhalb dieser Feuerschutzklappe an der Klappe vorbei in die Brandkammer gesogen werden. Dadurch wird das Gerät während der Prüfung abgekühlt. Dies ist ein Zustand, der im Entwurf der Technik durchaus berücksichtigt werden kann. Abdichten der FSK-externen Lücken, um den Flansch herum, bedeuten Zulassungsverstöße, da sonst die für das Design notwendige Abkühlung nicht mehr stattfindet. Eine Erklärung dieses Zustandes ist hier veröffentlicht: https://www.smacna.org/docs/default-source/technical-resources/improperfiredamperinstallation.pdf?sfvrsn=d121fda5_2 . Rauchabdichtung durch die FSK-externe Lücke ist dadurch nicht gewährleistet. Da bei der UL555 Brandprüfung mit negativem Druck in der Brandkammer getestet wird, sieht man die Rauchundichte während der Prüfung nicht, da ja kühle, und somit kühlende, Luft, am Produkt vorbei, in die Brandkammer gesogen wird. Es kommt also bei der Prüfung kein Rauch heraus, außen an der FSK vorbei, auch wenn es als Brand- sowie Rauchschutzprodukt bezeichnet wird. Wenn in der Praxis, allerdings, ein solches System unter Überdruck steht, ob in der Wand oder Decke eingesetzt, mit Brand und Rauch in einem Brandabschnitt, müssen andere Gegenmaßnahmen eingesetzt werden, um Rauchmigration in Fluchtwege, sowie andere Brandabschnitte, zu vermeiden. Dieses Bild ist Bestandteil einer zusammenhängenden Bilderserie, die auf https://community.nfpa.org/thread/45924 erwähnt werden, inklusive Video Link, unten in den Kommentaren. |
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| Source | Own work |
| Author | Achim Hering |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:27, 3 August 2020 | | 8,400 × 11,200 (20.44 MB) | Achim Hering (talk | contribs) | {{Information |description ={{en|1=3h smoke and fire damper, qualified to UL555 by means of fire testing under negative pressure, enabling cool, unexposed side, laboratory air to be drawn into the furnace through any gaps inside or outside of the damper, thus cooling down the system while being tested. Firestopping or any sealing of listing-mandated gaps voids the listing. SMACNA white paper on the topic: https://www.smacna.org/docs/default-source/technical-resources/improperfiredamperinsta... |
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