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| Table 1 | ||||||
| Initial capital cost (£) | Saving (%) | Operating cost (£) | Saving (%) | Whole life cost (£) | Whole life saving (%) | |
| (over 30 years) | ||||||
| Pre-insulated | ||||||
| ductwork | 37,000 | 21.5 | 67,672 | 20.4 | 104,672 | 20.8 |
| Insulated | ||||||
| galvanised | ||||||
| sheet metal | 47,154 | 85,058 | 132,212 | |||
| Table 2 | ||||||
| Velocity (m/s) | Cross-sectional | Flow rate (l/s) | Flow rate plus galv | Flow rate plus rigid | Reduction in | Reduction in |
| area (m²) | sheet steel ductwork | phenolic pre-insulated | flow rate (%) | fan power (%) | ||
| leakage (l/s) | ductwork leakage (l/s) | |||||
| 5 | 0.36 | 1800 | 2168.05 | 1811.04 | 16.5 | 41.7 |
| 7.5 | 0.36 | 2700 | 3068.05 | 2711.04 | 11.6 | 31.0 |
| 10 | 0.36 | 3600 | 3968.05 | 3611.04 | 9.0 | 24.6 |