Iminyango ye-UL engenamlilo isetshenziswa eNyakatho Melika nakwamanye amazwe nezifunda eziye zaqaphela izindinganiso ze-UL, ezihlangabezana nezidingo zokuzinza kokumelana nomlilo, ubuqotho kanye nokufakwa kwe-thermal phakathi nenkathi ethile yesikhathi. Ihluke kwezinye iminyango yomlilo, iminyango yomlilo evamile yaseMelika ibonakala ngokusobala ukuthi iminyango yomlilo evamile yaseMelika idinga ukudlula ukuhlolwa kwesiteleka samanzi omlilo.

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.