UNE-EN 1366-8:2025

This document specifies a test method for determining the fire resistance of smoke extraction ducts. It is applicable only to smoke extraction ducts that pass through another fire compartment from the fire compartment to be extracted in case of fire. It represents fire exposure of a fully developed fire.

This method of test is only applicable to fire resistant ventilation ducts (same construction) with the following classification according to EN 13501-3:

fire from inside and outside i ”! o;

applicable to a pressure difference up to 500 Pa;

NOTE 1 It is assumed that the duct A test(s) in accordance with EN 1366-1 has been performed with an under-pressure of minimum 500 Pa.

with integrity (E) and insulation (I) criteria equal to or higher than the intended classification for the smoke extraction duct.

For the purposes of the test described in this document, the duct is referred to as duct C.

This test method has been designed to cover both vertical and horizontal smoke extraction ducts. A vertical system need not be evaluated to this method provided that:

both horizontal (ho) and vertical (ve) classification according to EN 13501-3 has been obtained for the ventilation duct, and

it has been tested in a horizontal orientation to this method.

If the ventilation duct in practice is only used for vertical applications in smoke extraction systems, only vertical (ve) classification is bound to be used and tested in a vertical orientation to this method according to EN 13501-3.

This test method is suitable for ducts constructed from non-combustible materials (Euroclass A1 and A2 according to EN 13501-1).

NOTE 2 Reaction with components of the duct can reduce the oxygen concentration and lead to misinterpretation of the calculated leakage rate.

This standard applies to four sided ducts only (with fire exposure on all four sides). Ducts that utilize elements of construction for one, two or three sides are not covered. An alternative test method for one, two and three sided ducts will be developed separately.