C級鋼質防火門的耐火時間不應小於0.5小時。 C 級防火門的配件必須是防火的，以滿足規定的耐火極限。

rolling steel door fire rated,exterior fire rated steel doors,fire resistant doors,ecological fire door,white 34 inch fire rated steel insulated door,double leaf fire door,exterior fire rated steel doors,3小時防火門，ecological fire door,120 minute fire rated doors,white 34 inch fire rated steel insulated door,ul fire rated door,2 hours fire rated door,white 34 inch fire rated steel insulated door,防火門框，exterior fire rated steel doors,尺寸 9×21 或 10×21 防火鋼門，ecological fire door