23 32 36
Air-Distribution Floor Plenums
23 32 33
Air-Distribution Ceiling Plenums
23 32 13
Fabricated, Metal Air Plenums
23 32 00
Air Plenums and Chases
23 31 19
HVAC Casings
23 31 16.26
Concrete Ducts
23 31 16.19
PVC Ducts
23 31 16.16
Thermoset Fiberglass-Reinforced Plastic Ducts
23 31 16.13
Fibrous-Glass Ducts
23 31 16
Nonmetal Ducts
23 31 13.19
Metal Duct Fittings
23 31 13.16
Round and Flat-Oval Spiral Ducts
23 31 13.13
Rectangular Metal Ducts
23 31 13
Metal Ducts
23 31 00
HVAC Ducts and Casings
23 30 00
HVAC Air Distribution
23 25 26
Electronic Water Conditioning for HVAC Systems
23 25 23
Water Treatment for Humidification Steam System Feedwater
23 25 19
Water Treatment for Steam System Feedwater
23 25 16
Water Treatment for Open Hydronic Systems