Ugqinsi lweqabunga lomnyango wensimbi elingashisi we-UL lihlukaniswe izindinganiso ezintathu, okungukuthi, A, B kanye no-C, ezinokufakwa okuhle kakhulu komsindo nokusebenza kokufakwa kokushisa. Ingaphezulu lomnyango we-UL wensimbi ongashisi umlilo uphathwa ngokufafaza nge-electrostatic, futhi izingxenye ezisengozini njengamahinge, izingidi zeminyango, izivalo zeminyango ziyimikhiqizo yekhwalithi ephezulu. Iswishi ilula futhi iqinile.

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.