Umnyango ojwayelekile waseMelika ongenamlilo, isitifiketi se-WH esisekelwe ku-UL standard; Isicabha somlilo esijwayelekile saseBrithani, isitifiketi se-WH (UK) esisekelwe kuzinga le-BS476. Umnyango wethu waseMelika ojwayelekile ongashi unesitifiketi semizuzu engama-20-180. Izicabha zomlilo ezijwayelekile zaseBrithani zinezitifiketi zemizuzu engama-30 kuye kwengama-120. Iminyango yomlilo ingenziwa ngensimbi, ukhuni, insimbi engagqwali, njll. Siyakwamukela ukuthi uxhumane nathi.

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.