23 31 00 HVAC Ducts and Casings

23 31 16.19 PVC Ducts

23 31 13Metal Ducts23 31 13.13Rectangular Metal Ducts23 31 13.16Round and Flat-Oval Spiral Ducts23 31 13.19Metal Duct Fittings23 31 16Nonmetal Ducts23 31 16.13Fibrous-Glass Ducts23 31 16.16Thermoset Fiberglass-Reinforced Plastic Ducts23 31 16.19PVC Ducts23 31 16.26Concrete Ducts23 31 19HVAC Casings

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