| http://www.w3.org/ns/prov#value | - FIELD OF INVENTIONThe present invention relates to a fire retardant panel door and door frame, and more particularly to a fire retardant panel door and door frame that provides fire resistance of at least 90 minutes using a plurality of intumescent and fire resistant barrier layers therein for preventing the spread of fire through the fire retardant panel door and door frame.BACKGROUND OF THE INVE
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