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Ang oras ng paglaban sa sunog ng class B na steel fire door ay hindi dapat mas mababa sa 1.0 oras, at ang mga accessory ng hardware na ginamit sa fire door ay dapat ding gumamit ng refractory hardware accessories. Karaniwan ang gradong ito ng pintuan ng apoy ay karaniwang ginagamit para sa pintuan ng dekorasyon ng pamilya.

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