Clean Bench (Laminar Flow Cabinet)‌

A clean bench is an air purification device that provides a locally high-cleanliness environment. It generates a unidirectional stream of purified air through a filtration system, widely used for aseptic operations. Key aspects include its core functions, working principles, and operational protocols:

‌I. Working Principle‌

1. ‌Air Purification Process‌
   Room air is initially filtered by a pre-filter, then pressurized by a fan into a plenum chamber. It undergoes secondary filtration through a High-Efficiency Particulate Air (HEPA) or Ultra-Low Penetration Air (ULPA) filter, forming a vertical or horizontal laminar airflow (typical velocity: 0.3–0.6 m/s). This effectively removes contaminants from the work zone, achieving Class 100 cleanliness (per U.S. Federal Standard 209E)
2. ‌Airflow Direction Classification‌
   • ‌Vertical Laminar Flow‌: Airflows downward, suitable for biomedical applications to minimize operator exposure
   • ‌Horizontal Laminar Flow‌: Airflows horizontally outward, commonly used in electronics industries where health risks are lower

‌II. Core Structure & Types‌

‌III. Key Application Fields‌

• ‌Biomedicine‌: Cell culture, microbial inoculation, sterile formulation filling
• ‌Electronics Manufacturing‌: Semiconductor packaging, precision component assembly (dust control)
• ‌Food & Cosmetics‌: Microbial testing, high-cleanliness product filling
• ‌Research & Agriculture‌: Plant tissue culture, animal pathogen detection

‌IV. Operating Procedures & Precautions‌

1. ‌Startup Protocol‌:
   • Wipe surfaces with ethanol and sterilize via UV irradiation for 30 min
   • Turn on fan and lighting; keep glass sash closed
2. ‌Safety Notes‌:
   • ‌Does not protect operators‌: Operates under positive pressure, safeguarding samples but not isolating users from hazards (e.g., chemical vapors, pathogens)
   • ‌Distinguish from Biosafety Cabinets‌: Biosafety cabinets use negative pressure to protect personnel and environment
3. ‌Maintenance Requirements‌:
   • Replace pre-filters and HEPA/ULPA filters regularly; install in double-door rooms in tropical climates for extended lifespan
   • Avoid blocking air inlets to ensure stable airflow

‌V. Technical Parameters Example (VD-650 Model)‌

Product Details