| Standard | Content |
|---|---|
| Safety | Invulnerable to human body and equipment protection |
| Efficiency | Saving energy and application of up-to-date technology |
| Management | Simple and handy system arrangement |
| Economic feasibility | Considering operating expenses and durability |
| Reliability | Equipment with low rate of malfunction |
| Decorativeness | Shape being harmonious with architectural space |
| Responsiveness | Preparation to expected load increase |