Iminyango yomlilo yensimbi ye-UL inezilinganiso zomlilo ukusuka kumizuzu engama-20 kuye kwamahora ama-3. Umnyango Womlilo we-UL Uma kwenzeka umlilo, umnyango womlilo ungavimbela ukusabalala kwentuthu futhi ungavimba ngempumelelo ukusabalala komlilo.

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.