In determining targeted ACH, what external condition is NOT a consideration?

When determining the targeted air changes per hour (ACH) for effective drying in a commercial setting, it’s essential to consider various factors that influence the drying process. Outdoor temperature, the type of HVAC system in use, building saturation levels, and the presence of occupants can all impact the efficiency and effectiveness of the drying efforts. However, outdoor temperature is not typically considered a direct factor when establishing the targeted ACH for drying operations.

The rationale for this lies in the fact that the drying process is primarily influenced by internal conditions—such as the mechanics of air movement within the building (which are dictated by the HVAC system), the moisture content within the building materials (saturation level), and any activities or occupancy that could add moisture to the environment. While outdoor temperature may have an indirect effect on the overall comfort and potential for condensation issues, it does not play an integral role in calculating the specific ACH necessary for drying.

Understanding the dynamics of airflow and humidity within the building is crucial, which means focusing on how the internal systems operate and how moisture is being removed is paramount. Thus, outdoor temperature does not need to be a direct consideration in establishing ACH targets for effective drying processes.