Special fire-resistant components in ventilation technology – duct components

Special fire-resistant components in ventilation technology are service duct components consisting mainly of a supporting tray, cladding, supply and discharge lines, electrical cables and ventilation ducts – including the appropriate fire-stopping and fire-sealing measures where required. The services may or may not be separated with mineral wool filling.

The duct components may only be used in a vertical design to prevent the spread of fire from storey to storey for the fire-resistance duration verified for the assembly as a whole.

Regulatory framework

DIBt grants national technical approvals (abZ)/general construction technique permits (aBG) for vertically arranged special components for which a fire-resistance duration for preventing the spread of fire and smoke from storey to storey is required and which are used in ventilation and/or other ductwork.

If the cavities between the services integrated into the cladding of the special components/service duct components need to be filled with mineral wool, this must be done by machine. Only companies possessing sufficient expertise in this field and using personnel trained and certified by the holder of the national technical approval/general construction technique permit may do this.

Please also refer to the relevant provisions of the federal states following MVV TB 2020/1, Sections A 2.2.1.8 (MLAR) and A 2.2.1.11 (M-LüAR).

Technical rules

Muster-Richtlinie über brandschutztechnische Anforderungen an Leitungsanlagen (Muster-Leitungsanlagen-Richtlinie – MLAR) (13 pages)

Fassung 10.02.2015, zuletzt geändert durch Beschluss der Fachkommission Bauaufsicht vom 03.09.2020; Amtliche Mitteilungen 2021/3 (Ausgabe: 30. April 2021); Fachkommission Bauaufsicht der Bauministerkonferenz; DIBt (Hrsg.)

Muster-Richtlinie über brandschutztechnische Anforderungen an Lüftungsanlagen (Muster-Lüftungsanlagen-Richtlinie – M-LüAR) (29 pages)

Fassung: 29.09.2005, zuletzt geändert durch Beschluss der Fachkommission Bauaufsicht vom 03.09.2020; Amtliche Mitteilungen 2021/2 (Ausgabe: 30. April 2021); Fachkommission Bauaufsicht der Bauministerkonferenz; DIBt (Hrsg.)

Application forms

National procedure

A national technical approval (abZ) and/or oder general construction technique permit (aBG) is granted upon application (see Model Building Code (MBO), Sections 16a(2) and18(2) and (4)). This also applies to amendments and supplements to, or renewals of existing approvals and/or construction technique permits.

No formal requirements apply. The following information is needed: name and address of the applicant, description of the product and/or construction technique and its field of use or application, type of decision required (new decision, amendment or supplement to, or renewal of, an existing decision).

Please feel free to use the template below.

Application for a national technical approval and/or construction technique permit (3 pages)

Version: January 2018; Application form

Application for amendment / supplementation / renewal of a national technical approval and/or construction technique permit (4 pages)

Version: January 2018; Application form

Guideline: How to provide drawings for national technical approvals and general construction technique permits (5 pages)

Version: July 2017

  • abZ/aBG
  • Z = new decision | E = supplement | Ä = amendment | V = renewal | G = valid until
    Subject concerned Applicant Decision no. Validity
    from / to
    Feuerwiderstandsfähiges Installationsbauteil "AUSTROFLEX FIRE-FLOC"

    Austroflex Rohr-Isoliersysteme GmbH

    Finkensteiner Strasse 7

    9585 GÖDERSDORF-VILLACH

    ÖSTERREICH

    Z-41.9-704 Z: 03.01.2018
    G: 03.01.2023
    Feuerwiderstandsfähiges Installationsbauteil "AUSTROFLEX FIRE-FLOC GKB"

    Austroflex Rohr-Isoliersysteme GmbH

    Finkensteiner Straße 7

    9585 GÖDERSDORF

    ÖSTERREICH

    Z-41.9-705 Z: 08.01.2019
    G: 08.01.2024
    Feuerwiderstandsfähiges Installationsbauteil "Conlit Firesafe"

    DEUTSCHE ROCKWOOL GmbH & Co. KG

    Rockwool Straße 37-41

    45966 Gladbeck

    Z-41.9-709 Z: 07.11.2019
    G: 07.11.2024
    Feuerwiderstandsfähiges Installationsbauteil "Ecofibre Brandschutz 2x20mm"

    ECOFIBRE Dämmstoffe GmbH

    Arsterdamm 72

    28277 Bremen

    Z-41.9-712 Z: 30.09.2020
    G: 30.09.2025
    Feuerwiderstandsfähiges Installationsbauteil "Knauf Insulation ProtectFill (2 x 20 mm)"

    Knauf Insulation GmbH

    Heraklithstraße 8

    84359 Simbach am Inn

    Z-41.9-713 Z: 10.09.2021
    G: 10.09.2026
    Bauprodukte für feuerwiderstandsfähige Installationsbauteile "Geberit Quattro..."

    Geberit Vertriebs GmbH

    Theuerbachstraße 1

    88630 Pfullendorf

    Z-41.90-708 Z: 11.06.2019
    G: 11.06.2024

Juliane Valerius
Head of Section – Fire Protection of Ventilation Systems

Phone +49 30 78730-350
Email jva(at)dibt(.)de

Legal reference documents

Testing, certification, inspection