VWS Applications
- Aseptic dispensing
- Assembly of electronics and optics components
- Cell culturing
- Media pouring
- Preparation of medical devices
- Sterility testing
- VWS Series cabinets are intended for work with nonhazardous materials in such applications.
VWS Description
- VWS Series cabinets are self-contained Class 3.5 vertical laminar flow work stations designed for installation on standard laboratory benches, or on optional floor stands.
- Cabinets are available with work zone width of 90cm, 120cm or 180cm.
- Each cabinet is factory-tested and certified by a NATA-registered laboratory to establish compliance with the performance requirements. Please refer to our Standards page.
VWS Operation
- Vertical laminar flow in the work zone creates a biologically-clean, particle-free work environment.
- A direct-drive fan draws in ambient air through a prefilter on the top of the cabinet and supplies it to the work zone through a HEPA filter.
- The average vertical air velocity in the work zone is maintained between 0.45 and 0.5 m/s, with all velocity readings within 20% of their average.
- Air leaving the work zone is divided into two portions.
- Part of the airflow leaves through the work opening, with the balance recirculated to the fan/HEPA filter system via perforations in the lower section of the work zone.
- This reduces turbulence in the work zone, and extends HEPA filter service life. Air cleanliness within the work zone is better than Class 3.5 (Class 100). To enhance work zone air cleanliness, it is recommended that cabinets are installed in cleanrooms which provide a secondary barrier.
Constructions
- Cabinet
The housing is constructed in electro-galvanised steel, etch-primed and finished in a special baked enamel that has been developed for laboratory equipment.The work zone is constructed in Grade 304 stainless steel, with the fitting of panels designed to minimise crevices and to aid routine cleaning. A removable, washable metal screen protects the HEPA filter from mechanical damage. - Fans
A direct-drive fan is regulated by a speed controller to enable airflow to be maintained through filter life. Fans and filter plenums are designed to provide ultra-quiet operation and low vibration level. - HEPA Filters
Clyde-Apac HEPA filters are manufactured to the most exacting standards for critical applications. Each filter is individually certified to achieve an arrestance efficiency of not less than 99.995% to the stringent BS3928 Sodium Flame test, and to be leak-free in accordance with AS1807.6. - All testing is conducted in a NATA-registered factory laboratory and a NATA-endorsed test label, being an extract of the test report, is affixed to each filter. The positive-pressure filter seal is surrounded by a negative pressure zone, thus enhancing the reliability of the filter installation.
- Prefilters
An easily-accessed, washable prefilter arrests not less than 90% of particles 5 micron and larger, thus prolonging HEPA filter life. A warning light in the control panel signals the need for prefilter service.
