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Firebox (steam engine)
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===Firetubes=== Firetubes are attached to one wall of the firebox (the front wall for a longitudinal boiler, the top for a vertical boiler) and carry the hot gaseous products of combustion through the boiler water, heating it, before they escape to the atmosphere. Firetubes serve the additional purpose of staying the flat tube (flue) sheets (front and rear) so that only the top of the front flue sheet and the bottom of the rear flue sheet must be separately braced.
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