San Francisco : Architect and Engineer, Inc · leaf 21
UnderwritersLaboratories, Inc. Sal-Mo Supply Duct is tested for Fire Hazard Classification; Inflammability; Fire Retardant Classification; Fire Spread; Moisture Absorption. It has a K Factor of 0.294 B. T. U. Available in 26 sizes for domestic and industrial installation, and in flat sheets. Sal!…
Architecture · Building
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