| CSI Code | Short Description | Extended Description |
| 15800 | Air Distribution |
| 15810 | Duct | Duct Hangers and Supports Fibrous Glass Ducts Flexible Ducts Glass - Fiber - Reinforced Plastic Ducts Metal Ducts |
| 15820 | Duct Accessories |
| 15830 | Fan | Air Curtains Axial Fans Ceiling Fans Centrifugal Fans Industrial Ventilating Equipment Power Ventilators |
| 15840 | Air Terminal Unit | Constant Volume Variable Volume Units |
| 15850 | Air Outlets and Inlet | Diffusers, Registers, and Grilles Gravity Ventilators Intake and Relief Ventilators Penthouse Ventilators |
| 15860 | Air Cleaning Device | Air Filters Dust Collectors Electronic Air Cleaners High - Efficiency Air Filters ULPA Filters |