Fire-resistant air ducts

Fire-resistant air ducts that are assembled on site from CE-marked fire protective boards covered by a European Technical Assessment (ETA) issued on the basis of a European Assessment Document (EAD) and the related accessories are used as part of ventilation systems in buildings.

Fire-resistant air ducts prevent the spread of fire across separating elements for the verified duration.

Regulatory framework

DIBt grants general construction technique permits (aBG) for fire-resistant air ducts in cases where the ETA does not cover a complete kit consisting of fire protective boards and the associated seals, fittings, connections and fasteners.

Technical rules

MVVTB 2020/1, Annex 14, Section 6.3.3

Muster-Verwaltungsvorschrift Technische Baubestimmungen (MVV TB) 2020/1 (340 pages)

Ausgabe 2020/1; Amtliche Mitteilungen 2021/1 (Ausgabe: 19. Januar 2021)

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
    Bauart zum Errichten von Lüftungsleitungen aus Stahlblech mit Bekleidung aus THERMAX SL für eine Feuerwiderstandsdauer von 90 Minuten

    MINERALKA d.o.o.

    Cesta pod Slivnico 24

    SI 1380 CERKNICA

    SLOWENIEN

    Z-41.10-710 Z: 17.07.2020
    G: 17.07.2025
    Bauart zum Errichten von selbstständigen Lüftungsleitungen aus THERMAX SL für eine Feuerwiderstandsdauer von 90 Minuten

    MINERALKA d.o.o.

    Cesta pod Slivnico 24

    SI 1380 CERKNICA

    SLOWENIEN

    Z-41.10-711 Z: 17.07.2020
    G: 17.07.2025

Juliane Valerius
Head of Section – Fire Protection of Ventilation Systems

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

Legal reference documents