Here is a selection of commonly used correction factors (Fx) for unheated rooms:
Room Type / Description | Correction Factor (Fx) |
Standard | 0.5 |
Without exterior walls (e.g. interior corridors) | 0.1 |
With one exterior wall, without exterior doors | 0.4 |
With one exterior wall, with exterior doors | 0.5 |
With two exterior walls, without exterior doors | 0.5 |
With two exterior walls, with exterior doors | 0.6 |
With 3 exterior walls (e.g. stairwells) | 0.8 |
Boiler room (heating system room) | 0.2 |