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| Table 1: Typical pressure drops through an air handling unit | |
| Device | Pressure drop |
| Panel filter | 120 Pa (dirty) |
| Bag filter | 200 Pa (dirty) |
| Thermal wheel | 120 Pa |
| Cooling coil | 80 Pa (plus eliminator) |
| Heating coil | 10 Pa (single row) |
| Silencer | 50 Pa each (for supply and extract) |
| Heat recovery devices | 200 Pa |
| Terminals | 150 Pa (per box) |
| Run around coils | 60 Pa |
| Table 2: ECON 19 benchmark generator related to fan power | ||||||||
| Benchmark | Good practice | Typical practice | ||||||
| Office type1 | Type 1 | Type 2 | Type 3 | Type 4 | Type 1 | Type 2 | Type 3 | Type 4 |
| W/l/s | 1·0 | 1·0 | 2·0 | 2·0 | 1·5 | 1·5 | 3·0 | 3·0 |
| l/s/m2 (average) | 0·2 | 0·3 | 4·0 | 4·0 | 0·2 | 0·3 | 4·0 | 4·0 |
| W/m2 | 0·2 | 0·3 | 8·0 | 8·0 | 0·3 | 0·5 | 12 | 12 |
| h/y | 2500 | 2500 | 2750 | 3000 | 3000 | 3000 | 3500 | 3700 |
| kWh/m2 tfa* | 0·5 | 0·8 | 22 | 24 | 0·9 | 1·4 | 42 | 44 |
| *Treated floor area | ||||||||
| 1Type 1: Naturally ventilated cellular | ||||||||
| Type 2: Naturally ventilated open-plan | ||||||||
| Type 3: Air conditioned standard | ||||||||
| Type 4: Air conditioned prestige | ||||||||