This document outlines a framework for creating a comprehensive Cleanroom User Requirements Specification (URS). A well-defined URS is critical for ensuring that cleanrooms are designed to meet the specific needs of their intended purposes. It serves as a guide for the design, installation and validation of cleanroom facilities. Fundamental 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 outline the maximum allowable particle concentration per cubic mete