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When cold outside air is supplied to and heated inside a building the relative humidity will decrease.
Relationships between outdoor and indoor temperatures are indicated below
| Outdoor Temperature | Outdoor Relative Humidity (%) |
Indoor Temperature | Indoor Relative Humidity (%) |
| -7 (oC) 20 (oF) |
0 | 21 (oC) 70 (oF) |
0 |
| 20 | 3 | ||
| 40 | 6 | ||
| 60 | 8 | ||
| 80 | 11 |
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