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403.3.1.1.2.3.2 System Ventilation Efficiency
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The system ventilation efficiency (Ev) shall be determined using Table 403.3.1.1.2.3.2 or Appendix A of ASHRAE 62.1.
SYSTEM VENTILATION EFFICIENCYa,b
| Max (Zp) | Ev |
| ≤ 0.15 | 1 |
| ≤ 0.25 | 0.9 |
| ≤ 0.35 | 0.8 |
| ≤ 0.45 | 0.7 |
| ≤ 0.55 | 0.6 |
| ≤ 0.65 | 0.5 |
| ≤ 0.75 | 0.4 |
| > 0.75 | 0.3 |
- Max (Zp) is the largest value of Zp calculated using Equation 4-5 among all the zones served by the system.
- Interpolating between table values shall be permitted.
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