| Naics index | Naics index description |
|---|---|
| 238220 | Sewer hookup and connection, building |
| 238220 | Sheet metal duct work installation |
| 238220 | Snow melting system (e.g., hot water, glycol) installation |
| 238220 | Solar heating equipment installation |
| 238220 | Sprinkler system, building, installation |
| 238220 | Steam fitting contractors |
| 238220 | Sump pump installation |
| 238220 | Ventilating contractors |
| 238220 | Warehouse refrigeration system installation |
| 238220 | Warm air heating system installation |