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 protupožarna vrata, 31 godina iskustva u proizvodnji protupožarnih vrata i prozora. Glavna UL protupožarna vrata, EN protupožarna vrata, BS EN protupožarna vrata, itd. Imamo certifikate. ZHTdoors podržavaju OEM i besplatan dizajn. Naše prednosti: dobra kvaliteta, tvornička cijena, dobra usluga. Dobrodošli da nas konzultirate.