Tests carried out at the CSTC
Tests carried out on single and double doors at the CSTC (Technical and Scientific Construction Centre), an accredited laboratory, in accordance with current European standards:
EN 12207: Windows and doors – Airtightness – Classification
EN 1026: Windows and doors – Airtightness – Test method
The standards provide for 4 classes (L1, L2, L3, L4), ranked in order of air tightness, based on:
- either the length of the seals (m³/h.m)
- or the total surface area (m³/h.m²)
Class L4 therefore achieves the best air tightness (3 m³/h.m² at 100 Pa).