There are three types of steel fire doors: Class A steel fire doors shall have a fire resistance time of not less than 1.5 hours, Class B steel fire doors shall have a fire resistance time of not less than 1.0 hours, and Class C steel fire doors shall have a fire resistance time of not less than 0.5 hours.

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.