From the NFPA Quarterly v. 10, no.4, 1917
"Large spaces between partitions were used as ducts for pipes, vents, etc. and formed a flue of liberal size directly connecting the cellar with a large combustible attic. The result was that when the fire occurred in the cellar it immediately communicated to the attic causing the roof to collapse, and involving heavy damage to the entire building with the exception of the masonry walls."
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