Class II biological safety cabinet

Applications
Biological safety cabinets are the primary barrier against exposure to aerosols that may be produced from common microbiology procedures. In addition to protection for personnel and the room environment, many work programmes require that products are protected from airborne contamination.BH2000  Series   cabinets   provide  personnel, environment and product protection in applications involving biological agents which are classified as being of ordinary, potential or special hazard. These cabinets are not designed for use with biological agents of extreme hazard. For applications involving cytotoxic drugs, CG2000 Series Cytogard cabinets should be specified. 

Australian and International Standards
Please refer to our Standards page 
 
Description
BH2000 Series cabinets are part-recirculating laminar air flow enclosures with high efficiency particulate air (HEPA) filtration of exhaust air and an air barrier at the work opening. HEPA-filtered vertical laminar air flow which is recirculated in the work zone creates an ultra-clean work environment for product protection. An air barrier between the operator and the work zone is maintained by a flow of room air into a full width grille in the work opening. 

The barrier air mixes with the laminar flow air in a sump underneath the work surface, and is exhausted to the room via a HEPA filter. All positive pressure zones and filter seais are surrounded by negative pressure zones, so as to contain potentially hazardous aerosols. 

Standard cabinets have exhaust discharge on the right hand side. Optional left hand side or top exhaust is available. Cabinets are produced with a work zone width of 90cm, 120cm or 180cm and may be installed on standard laboratory benches or on optional floor stands. Embodying advanced system-monitoring technology, enhanced ergonomics and styling, BH2000 Series cabinets set a new standard in safety cabinet design and performance. 
 
Construction

Cabinet. 
Constructed in electro-galvanised steel with joints welded using a gas-shielded arc process. This method produces a robust, gas-tight housing which is able to withstand the rigours of transport and handling. Exterior finish is in a special baked enamel which has been developed for laboratory equipment. 

Work zone. 
Constructed in Grade 304 stainless steel with 2B finish. Corners are radiused and crevice-free for ease of cleaning and all surfaces are carefully dressed to remove sharp edges. The removable work tray is designed to allow cleaning access to its underside without removing it from the cabinet. A removable panel provides cleaning and service access to the rear plenum.A pneumatic mechanism assists the opening and closing of the viewing window without the need for external fasteners or catches. The window is self-supporting in the fully-open position to facilitate cleaning and access for large items. Opening the window with the cabinet running automatically engages a boost mode for enhanced containment by activating maximum exhaust airflow and the alarm systems. 

Dimensions.

Note: 
1.    For activated-carbon exhaust filter option, width (W) on side-exhaust cabinets 
       and height (H) on top exhaust cabinets increases by 260mm.
2.    Recommended exhaust discharge clearance is 600mm.
3.    Stand height is nominally 900mm.

Fans.
Separate direct-drive fans are provided for the exhaust and laminar flow HEPA filters. Fans are speed-controlled to enable airflows to be maintained through filter life. The fan control circuits are interlocked so that the laminar flow system will not operate until the exhaust system has achieved a containment condition. 

An audible alarm with rechargeable battery back-up and visible indicators signify any reduction in airflows. A manometer gauge located in the work zone monitors fan/filter system pressures. 

HEPA filters.
Clyde-Apac Microseal™ 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. 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. 

Electrical and diagnostics. 
A low-voltage touch-control panel is located on the front of the cabinet. A microprocessor-controlled diagnostic system provides continuous monitoring of critical cabinet functions with a digital display indicating the nature of any malfunction. The boost mode and a post-use over-run mode may be manually selected from the control panel. 

An integral fluorescent lamp housing reduces heat build-up near the operator. Glare-free lamps provide a minimum lighting intensity of 800 lux at the work floor. A splashproof, general purpose power outlet is fitted in the work zone. 

Quality Assurance and Control
Please refer to our Standards page. 

Standard features

Low  voltage  touch controls

Diagnostics system with digital display

Alarms and boost mode automatically engaged when viewing window is open

Boost mode selectable at control panel

Selectable post-use over-run timer

Germicidal UV lamp

Pneumatically-assisted viewing window

Hourmeter to record operating time

Magnehelic gauge to monitor fan systems

Splashproof power outlet in work zone

Stainless steel work opening cover

Comprehensive operation and maintenance manual

Options 

Additional power outlet

Activated-carbon exhaust filter

Gas tap with solenoid valve

Vacuum tap with  filter

Floor stand

Exhaust discharge on left hand side or top

Fumigation adaptor panels for work opening and exhaust

Pull-out writing surface (only with stand)

Experiment timer

On-site testing 
BH2000 Series cabinets are factory-tested and certified by a NATA-registered laboratory. Additional
testing and certification should be carried out on site prior to use, and subsequently: 

After any electrical or mechanical maintenance 

After filter replacement 

After re-location 

At least annually 

In special circumstances, such as a significant change in the work programme, or where unsafe cabinet operation is suspected