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607.4 Flammable Materials

Los Angeles Mechanical Code > 6 Duct Systems > 607.0 Use of Under-Floor Space as Supply Plenum for Dwelling Units > 607.4 Flammable Materials
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The enclosing material of the under-floor space, including the sidewall insulation, shall be not more flammable than 1 inch (25.4 mm) (nominal) wood boards (flame-spread index of 200). Installation of foam plastics is regulated by the building code.
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Related Code Sections


607.4 Duct Systems, Flammable Materials
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