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Introduction
Designed for the situation where is requested the operator, product and environmental protection from dangerous effects due to uncontrolled diffusion of air-transported contaminants and, in the same time, to avoid any biological interference from the environmental to the product during its handling.

Applications
Normally used in laboratory of microbiology, virology, haematology and cell culture.
Furthermore, used in innovative fields of scientific research and above all in the manipulation of:
· Recombinant DNA
· Oncogenous Virus
· Pathogenic agents
For a correct use and application of the cabinet here described, it is necessary to refer to the appropriate standard norm and rules in force in the country where the cabinet is used.

Definition
VBH 36, 48 and 72 cabinets produced by Steril S.p.A. are defined: Microbiological Safety Cabinet "BIOHAZARD" as designed to fulfil the above-described application. Class II as designed with a frontal working opening for the aspiration of 30% of the total air involved, at a minimum velocity of 0,4 m/sec., and the remaining 70% is recirculated through a HEPA filter in the working chamber with a laminar flow velocity of 0,45 m/sec. +/- 20% (as defined by German standard DIN 12950/10). Type A as, according to NSF 49 (U.S.A.) rules, designed to safely exhaust the amount of air from the front barrier to the room. Type B3 as, according to NSF 49 (U.S.A.) rules, designed to duct the exhaust air outside the room (for further technical information refer to the paragraph "Technical Specifications").

Certifications
VBH48 cabinet produced by Steril S.p.A. is certified by TÜV Product Service GmbH Hamburg as it satisfies the German standards DIN 12950/10 and certified by Laboratoire National d'Essais Paris as satisfies the French Standard NFX 44-201. Furthermore TÜV Product Service GmbH Hamburg certifies VBH72 as it satisfies the German standards DIN 12950/10.

Main Technical Specification
Work chamber and spillage tray in stainless steel AISI 304L "2B" finishing.In case of failure of the exhaust fan, the main recirculation fan is able to guarantee, for the period of emergency, the efficiency of the protection of the front barrier. Air filtration, both recirculate and exhaust air by means of HEPA filter type H14 (EN 1822) with efficiency of 99,999% at 0,3 micron particles size with DOP/DOS test Working surface in stainless steel AISI 304L "2B" finishing, 4 and 6 sectors removable and autoclavable. Available both in perforated and solid version. Front window, in laminated safety glass with camlock to provide an easier access for large items. Construction structure in steel epoxy-polyester powder painted, resistant to the most common industrial disinfectants. Ventilation system by means of n°2 motor blowers, one dedicated to the one-way airflow in the working chamber, equal to 70% of the total involved air, the other dedicated to exhaust the remaining 30%. The motor blowers are centrifugal types, direct driven motor with double aspiration and protection factor, respectively, of IP44 and IP20.

Command and Controls
Air ventilation control by means of automatic regulation of the revolution velocity of the motor-blower. High-resolution flow rate volumetric devices, directly interfaced to microprocessor, achieve the automatic regulation. The microprocessor guarantees the activity of the motor-blower and controls the optimal function even in presence of effects caused by progressive clogging of the HEPA filters. Alarm device optical (led) and acoustic (buzzer) type, activated, at real time, by the microprocessor.

· Fluorescent lights (n°2 - 36W each)
· Power socket 4 A UNEL IP 44 (right internal side)
· Vacuum line with manual tap (right internal side) manufactured in compliance with UNI/CIG regulations, piping made of copper and hose-bard 10 mm. diameter (external) for the connection to the main line.
· Gas line with manual tap (right internal side) manufactured in compliance with UNI/CIG regulations, piping made of copper and hose-bard 10 mm. diameter (external) for the connection to the main line. The gas line is provided with automatic safety valve for interruption in case of electric blackout and/or low gas feed pressure.
· Front closure panel in anodised aluminium with 30W germicidal UV lamp, wave length 253,7 nm (UV-C).
· DOP/DOS test inlet hose-barb port

Available size
90, 120, 180 cm.