This document outlines a framework for creating a comprehensive Cleanroom User Requirements Specification (URS). A well-defined URS is vital for ensuring that cleanrooms are constructed to meet the specific needs of their intended applications. It serves as a guide for the design, construction and validation of cleanroom facilities. Primary eleme

Cleanrooms are meticulously controlled environments that minimize the presence of airborne contaminants. To ensure a consistent level of cleanliness, cleanrooms are classified according to international standards such as ISO 14644 and US Federal Standard 209E. These classifications specify the maximum allowable particle concentration per cubic mete