Umnyango we-UL ongenamlilo unokuhlangabezana neemfuno zokuzinza kokumelana nomlilo, ukunyaniseka kunye nokufakwa kwe-thermal ngaphakathi kwexesha elithile. Isetyenziswa kuMntla Melika nakwamanye amazwe kunye nemimandla eye yaqaphela imigangatho ye-UL. Ngokwahlukileyo kwezinye iingcango zomlilo, iingcango zomlilo ezisemgangathweni zaseMelika zibonakaliswa ngokucacileyo ukuba iingcango zomlilo ezisemgangathweni zaseMelika kufuneka ziphumelele uvavanyo lokubetha kwamanzi omlilo.

ZHTdoors iingcango zomlilo, iminyaka eyi-31 yamava okuvelisa kwiingcango zomlilo kunye neWindows. Iingcango eziphambili zomlilo ze-UL, iingcango zomlilo ze-EN, iingcango zomlilo ze-BS EN, njl., Sine-certification.ZHTdoors ixhasa i-OEM kunye ne-design.Our yamahhala: umgangatho omhle, ixabiso lefektri, inkonzo enhle.Wamkelekile ukuba uqhagamshelane nathi.