Two clean room or clean areas are of particular importance to sterile drug product quality: the critical area and the supporting clean areas associated with it.
Critical Area – Class 100 (ISO 5) and minimum Class 10,000 (ISO 7) , can be Class 1,000 (ISO 6)
1.All clean room classifications based on data measured in the vicinity of exposed materials/articles during periods of activity.
2.ISO 14644-1 designations provide uniform particle concentration values for cleanrooms in multiple industries. An ISO 5 particle concentration is equal to Class 100 and approximately equals EU Grade A.
3.Values represent recommended levels of environmental quality. You may find it appropriate to establish alternate microbiological action levels due to the nature of the operation or method of analysis.
4. The additional use of settling plates is optional.
5. Samples from Class 100 (ISO 5) clean room environments should normally yield no microbiological contaminants.
A. Critical Area – Class 100 (ISO 5) clean aria classification
environmental conditions that must be designed to maintain pharmaceutical product sterility (CFR 211.42(c)(10)). Activities conducted in such areas include manipulations (e.g., aseptic connections, sterile ingredient additions) of sterile materials prior to and during filling and closing operations. This area is critical because an exposed product is vulnerable to contamination and will not be subsequently sterilized in its immediate container. To maintain product sterility, it is essential that the environment in which aseptic operations (e.g., equipment setup, filling) are conducted be controlled and maintained at an appropriate quality. One aspect of environmental quality is the particle content of the air. Particles are significant because they can enter a product as an extraneous contaminant, and can also contaminate it biologically by acting as a vehicle for microorganisms Appropriately designed air handling systems minimize particle content of a critical area. Air in the immediate proximity of exposed sterilized containers/closures and filling/closing operations would be of appropriate particle quality when it has a per-cubic-meter particle count of no more than 3520 in a size range of 0.5 µm and larger when counted at representative locations normally not more than 1 foot away from the work site, within the airflow, and during filling/closing operations. This level of air cleanliness is also known as Class 100 (ISO 5) clean room.
It is recommended that measurements to confirm air cleanliness in critical areas be taken at sites where there is most potential risk to the exposed sterilized product, containers, and closures. The particle counting probe should be placed in an orientation demonstrated to obtain a meaningful sample. Regular monitoring should be performed during each production shift. It is recommended conducting nonviable particle monitoring with a remote counting system. These systems are capable of collecting more comprehensive data and are generally less invasive than portable particle counters.
As provided for in the regulations, separate or defined clean areas of operation in an aseptic processing facility should be appropriately controlled to attain different degrees of air quality depending on the nature of the operation. Design of a given area involves satisfying microbiological and particle criteria as defined by the equipment, components, and products exposed, as well as the operational activities conducted in the area.
Clean area control parameters should be supported by microbiological and particle data obtained during qualification studies. Initial cleanroom qualification includes, in part, an assessment of air quality under as-built, static conditions. It is important for area qualification and classification to place most emphasis on data generated under dynamic conditions (i.e., with personnel present, equipment in place, and operations ongoing). An adequate aseptic processing facility monitoring program also will assess conformance with specified clean area classifications under dynamic conditions on a routine basis. The following table summarizes clean area air classifications and recommended action levels of microbiological quality
B. Supporting Clean Areas , Clean Aria Classification
Supporting clean areas can have various classifications and functions. Many support areas function as zones in which nonsterile components, formulated products, in-process materials, equipment, and container/closures are prepared, held, or transferred. These environments are soundly designed when they minimize the level of particle contaminants in the final product and control the microbiological content (bioburden) of articles and components that are subsequently sterilized.
The nature of the activities conducted in a supporting clean area determines its classification, clean room classification. FDA recommends that the area immediately adjacent to the aseptic processing line meet, at a minimum, Class 10,000 (ISO 7) standards (see Table 1) under dynamic conditions. Pharmaceutical Manufacturers can also classify this area as Class 1,000 (ISO 6) or maintain the entire aseptic filling room at Class 100 (ISO 5). An area classified at a Class 100,000 (ISO 8) air cleanliness level is appropriate for less critical activities (e.g., equipment cleaning).
C. Clean Area Separation
An essential part of contamination prevention is the adequate separation of areas of operation. To maintain air quality, it is important to achieve a proper airflow from areas of higher cleanliness to adjacent less clean areas. It is vital for rooms of higher air cleanliness to have a substantial positive pressure differential relative to adjacent rooms of lower air cleanliness. For example, a positive pressure differential of at least 10-15 Pascals (Pa)(Equal to 0.04-0.06 inches of water gauge.) should be maintained between adjacent rooms of differing classification (with doors closed). When doors are open, outward airflow should be sufficient to minimize ingress of contamination, and it is critical that the time a door can remain ajar be strictly controlled . In some cases, the aseptic processing room and adjacent clean rooms have the same classification. Maintaining a pressure differential (with doors closed) between the aseptic processing room and these adjacent rooms can provide beneficial separation. In any facility designed with an unclassified room adjacent to the aseptic processing room, a substantial overpressure (e.g., at least 12.5 Pa) from the aseptic processing room should be maintained at all times to prevent contamination. If this pressure differential drops below the minimum limit, it is important that the environmental quality of the aseptic processing room be restored and confirmed. The Agency recommends that pressure differentials between clean rooms be monitored continuously throughout each shift and frequently recorded. All alarms should be documented and deviations from established limits should be investigated. Air change rate is another important clean room design parameter. For Class 100,000 (ISO 8) supporting rooms, airflow sufficient to achieve at least 20 air changes per hour is typically acceptable. Significantly higher air change rates are normally needed for Clean room class of a Class 10,000 and Class 100 areas.
A suitable facility monitoring system will rapidly detect atypical changes that can compromise the facility’s environment. An effective system facilitates restoration of operating conditions to established, qualified levels before reaching action levels. For example, pressure differential specifications should enable prompt detection (i.e., alarms) of an emerging low pressure problem to preclude ingress of unclassified air into a classified room.
What is a Clean room:
Clean Area- It is an area in a pharmaceutical manufacturing company which is supposed to meet a cleanness standard of a defined particle and microbiological count and intern the cleanliness.
Clean room- In pharmaceutical manufacturing room is designed and controlled and maintained to attain a highest level of clean environment so as to prevent microbial (bacterial and viral ) and particulate matter contamination of drug products being handled in the clean room. Typically clean rooms are assigned a class depending up on its degree cleanness or its of capability to provide cleanness reproducibly and are required to meet an appropriate standard of air cleanliness classification. Clean rooms are of great importance in sterile dosage form or injectable dosage form manufacturing.
Standards used in classification of Clean rooms are as follows
1.US FED STD 209E Cleanroom Standards. 2.Cleanroom standards ISO 14644-1
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