DIN EN 14221 E:2001-09 Timber and wood-based materials in internal windows, internal door leaves and internal doorframes - Requirements and specifications
2007DIN EN 14221:2007-01 Timber and wood-based materials in internal windows, internal door leaves and internal doorframes - Requirements and specifications; German version EN 14221:2006
1970DIN EN 14221 E:2001-09 Timber and wood-based materials in internal windows, internal door leaves and internal doorframes - Requirements and specifications