23.31.00 HVAC Ducts and Casings

23.31.13.19 Metal Duct Fittings

23.31.13 Metal Ducts 23.31.13.13 Rectangular Metal Ducts 23.31.13.16 Round and Flat-Oval Spiral Ducts 23.31.13.19 Metal Duct Fittings 23.31.16 Nonmetal Ducts 23.31.16.13 Fibrous-Glass Ducts 23.31.16.16 Thermoset Fiberglass-Reinforced Plastic Ducts 23.31.16.19 PVC Ducts 23.31.16.26 Concrete Ducts 23.31.19 HVAC Casings

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