HJ VS-840U Single-Person Vertical Laminar Flow Clean Bench

Overview

The HJ VS-840U is a single-person vertical laminar flow clean bench engineered for ISO Class 5 (Fed. Std. 209E Class 100) particulate control in non-sterile but particle-sensitive laboratory operations. It employs unidirectional vertical airflow generated by a centrifugal blower system, directing filtered air downward across the work surface at a controlled velocity (0.25–0.45 m/s) to sweep airborne contaminants—microorganisms, dust, and aerosolized particles—away from the operator and sample zone. The system relies on a single high-efficiency particulate air (HEPA) filter (695 × 600 × 38 mm, ≥99.995% efficiency at 0.3 µm) installed in an optimized low-profile plenum, minimizing static pressure loss while maximizing uniformity of airflow distribution. Unlike biosafety cabinets, the VS-840U does not recirculate air nor provide personnel or environmental protection against hazardous agents; it is strictly intended for product protection in applications where sterility assurance is maintained externally (e.g., media preparation, component assembly, optical alignment, or non-pathogenic cell culture setup).

Key Features

• Compact plenum architecture with ultra-thin, filter-integrated design reduces overall cabinet height and improves workspace visibility.
• Anodized aluminum pre-filter ensures long service life and resistance to corrosion under routine cleaning protocols.
• Dual-speed electronically controlled fan system enables precise adjustment of face velocity to accommodate variable load conditions or procedural requirements.
• Integrated digital LCD control panel provides intuitive operation of lighting, UV germicidal irradiation, and blower speed—each function independently switchable with status indication.
• Tempered glass side panels and seamless aluminum-plastic composite work surface enhance structural rigidity, ease of decontamination, and ergonomic accessibility.
• Compliant LED-compatible fluorescent lighting (20 W) delivers ≥300 lx uniform illuminance across the full work area per IEC 61243-2 and ISO 8596 standards.

Sample Compatibility & Compliance

The VS-840U supports open-container handling of non-hazardous biological reagents, pharmaceutical intermediates, microelectronics components, and precision optics. Its airflow pattern and filtration performance meet ISO 14644-1:2015 Class 5 requirements for particle concentration (≤3,520 particles/m³ ≥0.5 µm), validated using calibrated light-scattering particle counters. Microbial recovery testing follows ISO 14698-1 guidelines, demonstrating ≤0.5 colony-forming units (CFU) per Φ90 mm settle plate per hour under standard operating conditions. While not certified to NSF/ANSI 49 or EN 12469, the unit conforms to general laboratory infrastructure requirements outlined in ISO/IEC 17025:2017 Clause 6.3 (environmental conditions) and supports GLP-compliant documentation when integrated into validated workflows.

Software & Data Management

The VS-840U operates as a standalone mechanical system without embedded firmware or network connectivity. All operational parameters—including blower speed, UV exposure duration, and lighting state—are manually set via the front-panel LCD interface. No data logging, remote monitoring, or audit trail functionality is included. For laboratories requiring traceability, external validation records (e.g., airflow mapping reports, filter integrity test logs, and periodic microbial monitoring results) must be maintained per internal SOPs aligned with ISO/IEC 17025 or FDA 21 CFR Part 11 principles where applicable.

Applications

• Preparation of microbiological growth media and sterile diluents in quality control labs.
• Assembly and inspection of sensitive electronic subassemblies under low-particulate conditions.
• Handling of laser optics, photomasks, and semiconductor wafers prior to cleanroom entry.
• Non-invasive manipulation of primary cell cultures or tissue explants in academic research settings.
• Calibration and functional testing of analytical instrumentation requiring vibration-isolated, low-dust environments.

FAQ

Does the VS-840U provide protection against biohazards or chemical vapors?

No. It offers only product protection via laminar airflow and is not suitable for work involving Risk Group 2+ pathogens, cytotoxic compounds, or volatile organic solvents.
What maintenance intervals are recommended for the HEPA filter?

Filter replacement frequency depends on ambient air quality and usage intensity; typical service life ranges from 12 to 24 months. Integrity testing (e.g., DOP/PAO scanning) should be performed semiannually per ISO 14644-3.
Can the unit be integrated into a building’s HVAC monitoring system?

No. The VS-840U lacks analog/digital output interfaces or BMS-compatible communication protocols.
Is UV irradiation validated for surface decontamination?

UV dose delivery (254 nm, 20 W) is sufficient for surface disinfection of stainless steel and glass after 15–30 minutes exposure, provided no shadowed zones exist; biological indicator testing is recommended for critical applications.
Does the unit comply with electromagnetic compatibility (EMC) directives?

Yes. It meets IEC 61326-1:2013 Class A emission limits and basic immunity requirements for laboratory environments.