Table 1.
Comparison between guidelines and codes used in the tropics.
| Patient rooms | |||||
|---|---|---|---|---|---|
| References | Design temperature (F) | Relative humidity (%) | Minimum total air change rate (ACH) | Minimum outdoor air change rate (ACH) | Pressure relationship to adjacent room |
| ASHRAE handbook | 75 | 30 (Winter), 50 (Summer) | 4 | 2 | Neutral |
| AIA guidelines | 70–75 | Not specified | 6 | 2 | Not specified |
| CIBSE guide B | 72–75 (Winter); 77 (Summer) | 40–70 | 6 | Not specified | Not specified |
| HTM 2025 guidelines | 68–72 | 40–60 | Not specified | Not specified | Neutral |
| ASHRAE manual | 70–75 | 30–60 | 6 | 2 | Not specified |
| Intensive care rooms | |||||
| References | Design temperature (F) | Relative humidity (%) | Minimum total air change rate (ACH) | Minimum outdoor air change rate (ACH) | Pressure relationship |
| ASHRAE handbook | 75–80 | 30–60 | 6 | 2 | Positive |
| AIA guidelines | 70–75 | 30–60 | 6 | 2 | Not specified |
| CIBSE guide B | Not specified | Not specified | Not specified | Not specified | Not specified |
| HTM 2025 guidelines | 68–72 | 30–60 | Not specified | Not specified | Neutral |
| ASHRAE manual | Not specified | Not specified | Not specified | Not specified | Not specified |