What ISO Class is required for a buffer room?

What ISO Class is required for a buffer room?

• A. Class 3
• B. Class 5
• C. Class 9
• D. Class 7

Answer: (D)

Air cleanliness in cleanrooms for sterile work is defined by ISO classes, which set the maximum allowable particle counts per cubic meter for particles of specific sizes. For a buffer room—the space where sterile preparation occurs and around the primary engineering controls—the standard requirement is ISO Class 7 or better. This level provides enough particle control to protect sterile products without being excessively restrictive. In context, ISO Class 7 is cleaner than ISO Class 8 (often the ante area) but not as clean as ISO Class 5 or lower. So for a buffer room, ISO Class 7 is the appropriate specification.

Air cleanliness in cleanrooms for sterile work is defined by ISO classes, which set the maximum allowable particle counts per cubic meter for particles of specific sizes. For a buffer room—the space where sterile preparation occurs and around the primary engineering controls—the standard requirement is ISO Class 7 or better. This level provides enough particle control to protect sterile products without being excessively restrictive.

In context, ISO Class 7 is cleaner than ISO Class 8 (often the ante area) but not as clean as ISO Class 5 or lower. So for a buffer room, ISO Class 7 is the appropriate specification.