When To Take the Reading of ISO 14644 for Cleaned Data Center

When To Take the Reading of ISO 14644 for Cleaned Data Center

By Ashraf Almuhtaseb | Data Center Technical Cleaning Expert | idata.center

When conducting ISO 14644 particle measurements for a cleaned data center, the readings shall be taken at specific times and under certain conditions to ensure accurate and compliant results. Here’s a breakdown of the appropriate timing:

1- After Cleaning and Stabilization: Immediately after the data center has been thoroughly cleaned and sufficient time has passed for the airflow and HVAC systems to stabilize.

Reason: The cleaning process can stir up particles in the air.

Stabilization time allows the particles to settle or be removed by the air filtration system (such as HEPA filters).

This ensures the reading represents the actual cleanliness of the environment under controlled conditions.

Stabilization Time: 30 minutes to 2 hours, depending on the airflow system efficiency and room size.

2- During “At-Rest” Condition:  It refers to when the data center is cleaned, equipment is installed, but no personnel or operations are taking place.

Once the environment is stabilized and no activity is happening (no technicians or staff present).

Reason: This condition helps determine the baseline cleanliness level of the data center without external contamination from people or equipment operation.

3- During “Operational” Condition: It refers to when the data center is fully functional, with equipment running and personnel performing routine tasks.

Reason: Provides insights into cleanliness during normal operating conditions, which is useful for monitoring ongoing compliance.

Note: most of entities which gives this kind of certificate are not accredited body to give such an ISO Certificate, it is better to call it:

o Report of Cleaning

o Conformity of ISO 14644

o Compliance of ISO 14644

About the Author

Ashraf Almuhtaseb is a Data Center Technical Cleaning Expert with over 9 years of specialized experience since 2017. He is the only independent professional in the MENA region — and one of very few globally — publishing dedicated, in-depth technical knowledge on data center cleaning standards, contamination control, and ISO 14644 compliance. Visit idata.center for more articles, guides, and resources.

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