Abstract: A fireproof louver panel includes a panel frame and a plurality of longitudinally extending slats attached to the panel frame. One or more of the slats has a shell and an intumescent layer that expands under heat to form an airtight seal. A fireproof door or window may include an external frame, an internal core of a fireproof material (among other materials), and one or more such fireproof louver panels. A method of fireproofing an opening includes affixing a movable fireproof closure in the opening, and placement intumescent layers on the closure and on louvers disposed therein so that the opening is sealed when the first intumescent layer and the second intumescent layer are both subjected to heat.

Abstract: A method of making a door and a door so made in which a board having a size of about that of the finished door is provided, an opening is cut out of the board, a peripheral inwardly extending tongue or flange is produced by cutting the edges that define the opening, a first molding having a width greater than the width of the flange is fixedly mounted on one side of the flange; a panel having a size and configuration of the hole is mounted on that part of the first molding extending beyond the flange, and a second molding having a width greater than the width of the flange is fixedly mounted on the other side of the flange so that the that part of the parts of the first and second molding overlap and sandwich the panel. In one such constructed door, the panel is smaller than the cutout opening such that the peripheral edges of the panel are spaced from the peripheral edges of the flange.