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| Table 1: Temperature rises are subdued when perforations in the ceiling are larger | ||||
| Ceiling type | Dry resultant temperature rise (ºC) | Average heat flux (W/m2) | Radiative heat transfer (%) | Overall heat transfer (%) |
| Mineral board | 8·5 | 10·3 | – | 50·5 |
| Steel (closed) | 7·8 | 14·1 | 79·4 | 69·1 |
| Steel (14·5% open) | 7·1 | 16·8 | 58·7 | 82·3 |
| Steel (20% open) | 6·4 | 17·5 | 46·4 | 86·2 |
| Steel (42% open) | 6·3 | 18·6 | 26·1 | 91·6 |
| Exposed slab | 6·0 | 20·4 | 28·9 | 100 |