Iminyango ye-UL engenamlilo iye yafakazelwa ukuthi ayinamlilo ihlolwe yizingxenye zomnyango ekuhlolweni komlilo okwenziwa ngokuvumelana nezindinganiso, ukuqinisekisa izici zabo zokusebenza komlilo njengeminyango engashi. Umnyango womlilo ojwayelekile waseMelika, isitifiketi se-wh esisekelwe ku-ul standard, nesitifiketi somlilo esiyimizuzu engama-20-180.

Iminyango yomlilo ye-ZHTdoors, iminyaka engu-31 yesipiliyoni sokukhiqiza eminyango yomlilo kanye neWindows. Iminyango yomlilo eyinhloko ye-UL, iminyango yomlilo ye-EN, iminyango yomlilo ye-BS EN, njll., Sine-certification.ZHTdoors isekela i-OEM kanye ne-design yamahhala.Izinzuzo zethu: ikhwalithi enhle, intengo yefekthri, isevisi enhle.Siyakwamukela ukuthi uxhumane nathi.