A. Class II Type B2 Cabinet:

Type B2 cabinets are sometimes referred to as “total exhaust”.

This type of unit:

    • Maintains minimum average inflow velocity of 100 fpm through the work area access openings.
    • Has HEPA-filtered downflow air drawn from the laboratory or outside air (i.e., downflow air is not recirculated from the cabinet exhaust air).
    • Exhaust all inflow and downflow air to the atmosphere after filtration through HEPA filter without recirculation in the cabinet or return to the laboratory room air.
    • Has all contaminated ducts and plenums under negative pressure, or surrounded by directly exhausted negative pressure ducts and plenums (not recirculated through the work area).

Type B2 cabinets may be used with biological agents treated with toxic chemicals and radionuclides required as an adjunct to microbiological studies.

A. Class II Type A2 Cabinet:

Type A2 Cabinets are sometimes referred to “convertible” type units. Some manufactures of equipments have described their” convertible” unit (from Type A Type B) as having a change in air balance from 70 percent recirculate and 30 percent exhaust to 30 percent recirculate and 70 percent exhaust.

Type A2 cabinets are suitable for work with biological agents treated with minute quantities of toxic chemicals and trace quantities of radionuclides that will not interface with the work if recirculated in the downflow air.

All of the contaminated air flows to a common plenum where part of the air is recirculated and part is exhausted. Essentially, the cabinet Type A2 performs as a Type A with a change in air balances.

These types of units are designed to:

  • Maintain a minimum average inflow velocity of 100 fpm through the work area access opening. (Supply air to the workspace and exhaust air flowing through HEPA filters from a common plenum).
  • Have HEPA-filtered down flow air from that is a portion of the mixed down flow and inflow air from a common exhaust plenum.
  • Have all biological contaminated ducts and plenums under negative pressure or surrounded by negative pressure ducts or plenums. This does lend the “convertible” Type A2 some credence as being different from as type A.

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CRCA / GI Powder Coated / Stainless Steel 304 MFD-BS/A2-600 750 x 875 x 2250 mm 610 x 610 x 610 mm
MFD-BS/A2-900 1050 x 900 x 2250 mm 915 x 610 x 610 mm
MFD-BS/A2-1200 1350 x 900 x 2250 mm 1220 x 610 x 610 mm
MFD-BS/A2-1800 1950 x 900 x 2250 mm 1830 x 610 x 610 mm
Material of Construction (Work Table) Stainless Steel 304
Average Air Velocity 90 ± 20% FPM
HEPA / ULPA Efficiency 99.997% / 99.999%
Class Level ISO 3 / 5 (Class 100)
Noise Level 65 ± 5 dB
Electrical 230 V, 50 Hz, Single Phase
Special Features Motor driven front door, alarm, HEPA filter blockage, timer for UV light, power socket inside the cabinet, pressure sensor monitoring, digital airflow verification,, interior eye level display, display parameters including down flow air velocity, total operating hours.
Standards US FED STD 209 E, ISO 14644-1, IEST- RP-CC-002-2, BSI
Certifications CE & ISO
Note: The above mentioned model are available with Microprocessor controls and Custom built types also