EU Trademark Classification EU11 Lighting, heating and air conditioning Draught regulators for preventing the spread of smoke Class 11 Draught regulators for preventing the spread of smoke 28832 防止烟雾扩散用通风调节器 Chinese 防止烟雾扩散用通风调节器 English Draught regulators for preventing the spread of smoke Site ref. 28832 Class 11 Included in Harmonised Database (HDB)