Každý typ stavebného výrobku má vlastný spôsob vyjadrenia požiarnych vlastností. V tejto sérii vysvetľujeme, ako správne čítať a rozumieť klasifikačné označenia podľa príslušných európskych noriem.
Časť 1 – Klasifikácia požiarnej odolnosti vzduchotechnických potrubí
Článok vysvetľuje, ako čítať a rozumieť klasifikácii vzduchotechnických potrubí podľa EN 13501-3 a čo znamenajú jednotlivé časti klasifikačného označenia. Celý článok je dostupný v angličtine:
Applicable standards
- Testing: EN 1366-1:2014+A1:2020
- Classification: EN 13501-3:2025
- Extended application of test results: EN 15882-1:2011+A1:2017
| Designation | Meaning | Note |
|---|---|---|
| E | Integrity | |
| EI | Insulation | |
| ttt | Classification period | 15, 20, 30, 45, 60, 90, 120, 180, 240 minutes |
| ve | Vertical orientation of duct | |
| ho | Horizontal orientation of duct | |
| (o→i) | Fire outside duct | Duct A |
| (i→o) | Fire inside duct | Duct B |
| (i↔o) | Fire from inside to outside duct and vice versa |
|
| S | Smoke leakage | Valid for duct A only |
How to read the classification of ventilation ducts
The fire resistance classification of ventilation ducts according to EN 13501-3 defines how long a duct maintains its integrity (E) and, where applicable, its insulation (I) during fire exposure.
Each classification code includes several elements describing the test conditions:
- fire resistance time in minutes (e.g. 45, 90, 120);
- duct orientation – vertical (ve) or horizontal (ho);
- direction of fire exposure – from outside (o→i), from inside (i→o), or from both sides (i↔o);
- and possibly enhanced leakage performance (S), which applies only to duct type A.
Examples
EI 45 (ho o→i) S
This represents the classification of a horizontal duct exposed to fire from outside. The integrity, insulation and smoke leakage criteria are satisfied for a classification period of 45 minutes.
EI 30 (ve ho i↔o)
This indicates a ventilation duct capable of satisfying the integrity and insulation criteria for 30 minutes, from inside to outside and vice versa, in both vertical and horizontal applications.
