| Code | Description |
| CM | Sand filter/"Dual media" filter |
| CA | Regenerative filter |
| CL | Cartridge filter |
| CY | Miscellaneous filters |
| GC | Specific filters for H.V.A.C. |
| GY | Chemical filter scrub |
| CQ | Coalescence filter and separator |
| CE | Static mixer |
| CJ | Mixer/Agitator (motorized) |
| GL | UV type sterilizer (for water), Water softener and Demineraliser |
| ET | Transformers and autotransformers |
| EM | MCC switchgears |
| EH | Medium Voltage switchgears |
| TB | Atmospheric storage tank, cylindrical (floating roof) |
| TC | Atmospheric storage tank, not cylindrical |
| TD | Spherical or spheroid tank |
| TE | Bin bulk storage |
| TG | Silos |
| TH | Drainage separator basin |
| TJ | Diaphragm Tank |