UL 45 minute fire rated metal door,120 mins fire door,20mintues fire rated hollow metal door

In case of fire, the fire door will be baked in a high temperature environment for more than 30 minutes. Therefore, in order to prevent harmful gas generated after high temperature combustion, the filling materials and adhesives inside must be non-toxic and harmless. No matter what kind of fireproof door is made of, the fire resistance limit of Grade C can reach more than 30 minutes.

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