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International
Standard
ISO 6944-1
Second edition
Fire containment — Elements of
2024-06
building construction —
Part 1:
Ventilation ducts
Endiguement du feu — Éléments de construction —
Partie 1: Conduits de ventilation
Reference number
© ISO 2024
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Published in Switzerland
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Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Apparatus . 2
5 Test conditions .10
6 Test specimen .11
6.1 Size .11
6.1.1 General .11
6.1.2 Length .11
6.1.3 Cross-section .11
6.2 Number .11
6.3 Design .11
6.3.1 General .11
6.3.2 Minimum separation .11
6.3.3 Configuration of duct A (horizontal only) . 12
6.3.4 Openings in duct B . 12
6.3.5 Joints in horizontal ducts . 12
6.3.6 Joints in vertical ducts . 13
6.3.7 Support for vertical ducts. 13
6.3.8 Compensators .14
7 Installation of test specimen . . 14
7.1 General .14
7.2 Standard supporting construction . 15
7.3 Non-standard supporting constructions . 15
7.4 Restraint of ducts .16
7.4.1 Inside the furnace .16
7.4.2 At the penetration point .16
7.4.3 Outside the furnace . .16
7.4.4 Closure . .16
7.4.5 Fire stopping .16
7.4.6 Unsupported vertical ducts .16
8 Conditioning .16
8.1 General .16
8.2 Hygroscopic sealing materials .16
9 Application of instrumentation . 17
9.1 Thermocouples .17
9.1.1 Furnace thermocouples (plate thermometers) .17
9.1.2 Unexposed surface thermocouples .19
9.2 Pressure . 22
10 Test procedure .23
10.1 General . 23
10.2 Control of conditions to permit assessment of integrity . 23
10.2.1 Duct A . 23
10.2.2 Duct B . 23
10.3 Test measurements and observations . 23
10.3.1 Integrity . 23
10.3.2 Insulation .24
10.3.3 Restraint forces and thermal elongation or shortening .24
10.3.4 Additional observations.24
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10.4 Termination of the test .24
11 Performance criteria .24
11.1 Integrity .24
11.2 Insulation .24
11.2.1 General .24
11.2.2 Ducts with internal combustible linings only .24
11.3 Smoke leakage . 25
11.4 Determination of fire resistance . 25
12 Test report .25
13 Field of direct application of test results .25
13.1 General . 25
13.2 Vertical and horizontal ducts . 25
13.3 Sizes of ducts . 26
13.4 Pressure difference . 26
13.5 Height of vertical ducts . 26
13.5.1 Ducts supported at each storey .
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