Biological Safety Cabinet (Class II Type A2/B2)
Precision biosafety containment workstation engineered to provide critical microbiological protection when handling risk group 1, 2, and 3 pathogens. Available in 70% recirculation Type A2 or 100% total exhaust Type B2 configurations with negative pressure plenum design.
Engineering Overview & Fluid Dynamics
Active contamination barrier and laminar downflow principles
The Himalayan Steel Class II Biological Safety Cabinet is engineered according to EN 12469 and NSF/ANSI 49 standards to deliver absolute 3-way protection: operator protection (via high-velocity inflow air barrier), product protection (via vertical laminar downflow), and environmental protection (via 99.997% certified HEPA exhaust filtration). In Type A2 configuration, 70% of air recirculates while 30% exhausts through a dedicated top HEPA filter; in Type B2, 100% of air exhausts directly to dedicated ductwork, permitting safe handling of volatile toxic chemicals and radionuclides.
Technical Engineering Specifications
Standard dimensional tolerances, electrical parameters, and air quality ratings
Standard Dimensional Matrix
Fabrication schedule comparison in Imperial and Metric standards
| Size (Feet) | Metric (MM) | Internal Chamber (W x D x H) | External Footprint (W x D x H) |
|---|---|---|---|
| 3 ft (Compact) | 900 x 750 x 1400 mm | 900 x 600 x 650 mm | 1050 x 850 x 2150 mm (with stand) |
| 4 ft (Standard Benchmark) | 1200 x 750 x 1400 mm | 1200 x 600 x 650 mm | 1350 x 850 x 2150 mm |
| 5 ft (Spacious) | 1500 x 750 x 1400 mm | 1500 x 600 x 650 mm | 1650 x 850 x 2150 mm |
| 6 ft (Dual Station) | 1800 x 750 x 1400 mm | 1800 x 600 x 650 mm | 1950 x 850 x 2150 mm |
Cleanroom Construction & Architectural Design
cGMP sanitary fabrication details from our Baddi engineering works
Single-piece deep-drawn interior chamber fabricated from AISI 316L with zero welds on corners, eliminating all contaminant trapping crevices.
Contaminated air plenums are completely enveloped by negative pressure channels, ensuring any micro-leak is drawn back into the HEPA filter.
Electronically commutated motorized blower automatically increases power output as filters load, maintaining steady 0.53 m/s inflow velocity.
Angled front sash profile minimizes operator neck strain, glare, and arm fatigue during prolonged micro-pipetting sessions.
Bottom sump pan beneath the work surface captures up to 4 liters of liquid spills, equipped with a stainless quarter-turn drain ball valve.
Side wall sealed service cable pass-through ports and brass utility petcocks for vacuum, nitrogen, and burner gas.
Standard Operating Protocol (cGMP SOP)
Standard operating guidelines and contamination control sequence
Step-by-Step Material Transfer Sequence
Sanitization & Wipe-Down Protocol
- Decontaminate work tray surface before and after each session using 70% IPA.
- Clean the spill trough beneath the work tray monthly using disinfectant and drain via bottom valve.
- Perform annual gaseous formaldehyde or hydrogen peroxide vapor decontamination before filter changes.
Fail-Safe Interlock Protection
- Audio-visual alarm immediately activates if front sash is moved above or below safe operating aperture.
- Blower interlock cuts gas supply solenoid automatically if airflow drops.
Optional Engineering Customizations
Site-specific hardware adaptations
- Formalin / Hydrogen Peroxide fumigation decontamination sealing plate
- Exhaust canopy thimble connection for Type A2 duct hookup
- ULPA U15 filter upgrade (99.9995% efficiency @ 0.12 micron)
- Ergonomic stainless steel armrest bar with comfort padding
- Height-adjustable motorized motorized ergonomic base stand
- Flammable gas safety solenoid valve linked to blower interlock
Quality Validation Package (DQ/IQ/OQ)
Audit-ready documentation for US FDA and EU-GMP inspections
- Design Qualification (DQ) Documentation & P&ID Schematics
- Installation Qualification (IQ) Protocol Checklists
- Operational Qualification (OQ) Airflow Velocity Profile Mapping
- HEPA Supply & Exhaust Filter DOP/PAO Integrity Test Certificates
- Potassium Iodide (KI) Discus Operator Containment Test Report
- Microbiological Microbiological Retention Validation Certificate
Cleanroom Design Highlights
- Surrounding negative pressure plenums guarantee zero toxic leak to laboratory atmosphere
- Dual certified H14 HEPA filters capture 99.997% of airborne microbes and particulates
- Motorized front glass sash with optical height sensors and audio-visual limit alarm
- Removable divided multi-piece SS 316L work tray for easy autoclaving and spill cleanup
Target Pharmaceutical Applications
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