Classification of Clean Bench

Clean benches, also known as laminar flow benches or clean air benches, are specialized workstations designed to provide a controlled, clean environment for various applications, particularly in fields such as pharmaceuticals, biotechnology, electronics manufacturing, and research laboratories. Clean benches are classified based on several criteria, including airflow direction, cleanliness level, and application-specific features. Here are some common classifications of clean benches:

1. **Airflow Direction**:

  - **Horizontal Clean Bench**: In horizontal clean benches, filtered air flows horizontally over the work surface and then exits through an exhaust system. This configuration provides a clean working environment for tasks such as sample preparation, assembly, and inspection.

  - **Vertical Clean Bench**: Vertical clean benches have filtered air flowing vertically downward onto the work surface, creating a sterile workspace. They are commonly used for tasks such as microbiological testing, tissue culture, and PCR (polymerase chain reaction) work.

2. **Cleanliness Level**:

  - **ISO Class**: Clean benches are classified based on the level of air cleanliness they can maintain, as defined by ISO (International Organization for Standardization) standards. Common classifications include ISO Class 5, ISO Class 7, and ISO Class 8, with ISO Class 5 being the cleanest.

  - **HEPA or ULPA Filters**: Clean benches typically use HEPA (High-Efficiency Particulate Air) or ULPA (Ultra-Low Penetration Air) filters to achieve the required level of cleanliness by removing airborne particles down to a specified size.

3. **Application-Specific Features**:

  - **Biological Safety Cabinets (BSCs)**: Some clean benches are equipped with additional features, such as HEPA-filtered exhaust systems and containment features, to provide a safe environment for handling biological materials and pathogens.

  - **Chemical Fume Hoods**: Clean benches with chemical fume hood functionality incorporate airflow control and chemical-resistant materials to protect users from exposure to hazardous chemicals and fumes.

  - **UV Germicidal Lamps**: Certain clean benches may include UV germicidal lamps to sterilize the work surface and reduce microbial contamination during operation.

4. **Size and Configuration**:

  - Clean benches come in various sizes and configurations to accommodate different workspace requirements and applications. They may be standalone units or built into laboratory furniture or enclosures.

  - Customizable features such as adjustable shelves, access ports, and lighting options allow users to tailor clean benches to their specific needs.

In summary, clean benches are classified based on airflow direction, cleanliness level, application-specific features, and size/configuration. Understanding these classifications helps users select the appropriate clean bench for their specific requirements, ensuring a controlled and clean environment for their applications.