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Combustion properties and smoke toxicity of common decoration materials: PVC panels are flammable; they produce large amounts of dense smoke, with high concentrations of toxic or irritating gases such as carbon monoxide and hydrogen chloride in the smoke. Non-flame-retardant wooden ceilings are combustible; the smoke contains toxic gases such as carbon monoxide and nitrogen oxides. Non-flame-retardant wood, plywood, and particle board are combustible; the smoke they produce contains toxic gases such as carbon monoxide and nitrogen oxides. Phenolic foam is difficult to ignite; the concentrations of toxic gases such as cyanide and carbon monoxide in the smoke are very high. Flame-retardant rubber and plastic foam, flame-retardant polyurethane foam, flame-retardant extruded polystyrene foam: difficult to extinguish; produce large amounts of thick smoke, with toxic or irritating gases such as carbon monoxide, hydrogen chloride, cyanides, and nitrogen oxides present in the smoke. PVC splice boards are flammable and produce large amounts of smoke; the smoke contains high concentrations of toxic or irritating gases such as carbon monoxide and hydrogen chloride. Soft polyurethane foam is flammable and produces large amounts of thick smoke; the concentration of toxic gases such as cyanide and carbon monoxide in this smoke is very high. Non-flame-retardant rigid polyurethane foam is flammable and produces large amounts of dense smoke; the concentration of toxic gases such as cyanide and carbon monoxide in this smoke is very high. Non-flame-retardant polystyrene foam is highly flammable and produces large amounts of smoke; the smoke contains toxic gases such as carbon monoxide and nitrogen oxides. Wool carpets are difficult to burn; the concentrations of toxic gases such as cyanide and carbon monoxide in the smoke are very high. Acrylic fabrics can produce toxic fumes such as cyanide and carbon monoxide at very high concentrations when burned. Flame-retardant nylon carpets, flame-retardant polypropylene area rugs. These materials are difficult to burn; the smoke produced contains toxic gases such as carbon monoxide and nitrogen oxides. Flame-retardant curtains or shades are difficult to burn; the smoke contains toxic gases such as carbon monoxide and nitrogen oxides. Non-flame-retardant curtains or drapes are flammable; the smoke contains toxic gases such as carbon monoxide and nitrogen oxides.