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The firebox
The firebox consists of three sections: 1) top/smoke shelf (the 30" firebox has two top pieces; a 24" firebox with a single-piece top section is shown at left), 2) center/back section, and 3) base/bottom. The box is cast of concrete and vermiculite, and is lined with real firebrick. Vermiculite is used to reduce the firebox's weight, and also to provide heat transfer. The firebrick interior, while reducing heat transfer, creates a realistic masonry look. FMI's air-cooled chimney is used for easy and inexpensive lightweight venting. (Frames use either a 24" or 30" firebox.)
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