Defines T30, T60, T90 — the German classifications for fire doors in Langerwehe.
A fire door is a building-authority-approved fire-resisting closure. It protects escape routes for a defined duration — 30, 60 or 90 minutes (T30, T60, T90 in German classification, EI30/EI60/EI90 by European norm). Every door we install in Langerwehe carries an approval number and a declaration of conformity that the consultant can verify.

