External door
External doors are often used as emergency exits which are also burglary retardant in stores, retail shops, function rooms, concert halls, industrial buildings, etc. They can also be used indoors…
Thermal insulation EN 10077-1 & EN 10077-2 : T0, T1, T2, T3, T4, T5
When doors are fitted in a wall which separates two rooms that have a different operating temperature (e.g. between living areas and communal areas) or between internal premises and the external environment, they must have thermal insulation capability.
To be considered to have thermal insulation properties, the door must have a U value of ≤ 3.5 W/m²K and guarantee a minimum air tightness (minimum of class L2).
Standards table
| European standards | EN 10077-1 EN 10077-2 |
|---|---|
| Symbols | T |
| Resistance class | According to declared Uw values: T0: >3.5 W/m2K T1: ≤3.5 W/m2K T2: ≤3.0 W/m2K T3: ≤2.5 W/m2K T4: ≤2.0 W/m2K T5: ≤1.5 W/m2K T6: ≤1.0 W/m2K |
| Resistance class Heinen |
T0 T1 T2 T3 T4 T5 |
Heinen s products with this performance
Standards
The thermal insulation coefficient value U is calculated according to the following European standards:
- EN 10077-1: Thermal performance of windows, doors and shutters – Calculation of thermal insulation coefficient – Part 1: General
- EN 10077-2: Thermal performance of windows, doors and shutters – Calculation of thermal insulation coefficient – Part 2: Numerical method for frames
These standard provide for 7 categories, classified in ascending order of thermal insulation (U):
Class T6 thus obtains the best thermal insulation.
N.B. => Legally defined value in Belgium: T4 ≤ 2.0 W/m²K!
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