Class II Biosafety cabinet – Type A2

  • Aeromech™ Class II Biosafety Cabinet Type A2 is designed for protection of operator, product and environment from pathogenic agents and microorganisms transmitted in respiratory way and also for creation of a bacterial dust free air environment. It has a common plenum from which 30% of air is exhausted, and 70% re-circulated to the work area as the downflow. Type A cabinets exhaust air directly back to the laboratory, and they may contain positive pressure contaminated plenums. When toxic chemicals must be employed as an adjunct to microbiological processes, these cabinets should not be used. Exhaust HEPA filtration only removes airborne aerosols including biohazards, and not chemical fumes.
  • The Class II Type A1 has the positively-pressurized contaminated plenum bordering the ambient environment, and therefore is less safe than the Class II Type A2 that has a negative pressure surrounding the positively pressurized contaminated plenum. In case there is a leakage on the positive plenum, the leaking aerosol will be pulled by the negative pressure back to the positive plenum, and it will not leak out. Because of the safety issue, the Type A1 design is now considered obsolete. In the A2 cabinet, about 70% of air from the positive plenum is recirculated as downflow, and the remaining All Class II biological safety cabinets A2 is suitable for work with microbiological agents assigned to biosafety levels 1, 2 and 3.
1 Product Class II Biosafety Cabinet –Type A2
2 Air balancing 70% recirculation.30% exhaust
3 Protection  Product & Personnel & Environmental protection
4 Bio safety Level Bio safety Level 1 , 2 & 3
5 Exhaust Requirement Return to Laboratory or Thimble Ducting Only
6 Cleanliness level ISO class 5 as per ISO 14644-1
7 Average Airflow Inflow Velocity
 Minimum 0.45 m/s ( 90 FPM) at 8” front opening
8 Velocity Down Velocity
 0.30 m/s ( 65 FPM)
9 Noise level 60 db on A scale
10 Light Intensity Minimum 900 lux inside the working area at ambient zero
11 MOC Main Body -  Galvanized Iron with PU coated / Stainless Steel – Satin Finish
Working Area -  Stainless Steel IS 304 Grade Satin Finish
12 Supply Filter HEPA Filter having EU 13 rating with suitable size.
  Efficiency 99.99% down to 0.3 Microns.
13 Exhaust Filter HEPA Filter having EU 13 rating with suitable size.
Efficiency 99.99% down to 0.3 Microns.
14 Pre Filter Aeromech® make, EU 4 rating with suitable size.
Efficiency 90% down to 10 Microns.
15 Noise Level Less than 70 db 'A'.
16 Vibration Level Minimum.
17 Magnehelic Differential Pressure Gauge 01 No. (make : Dwyer, USA) with each unit 
(To measure differential pressure across the supply HEPA filter).
Statically & Dynamically balanced with suitable rating and size.
18 Motor Blower Assembly (Induction motor with centrifugal blower) A Mounting unique spring suspension system to take care of vibration and noise.
19 3 Pins Switch & Socket 15 AMPS - 1 set in each unit.
20 Other Switches On/Off switches for motor blower & CFL lights

Aeromech™ Class Il, Type A2 Laminar Flow Biological Safety Cabinet provides protection for the user, product and the environment from particulate and aerosol hazards. The work area of the biological safety cabinet is continuously bathed with positive pressure ISO 5/Class 100 HEPA-filtered air to protect the product from contamination while an inward airflow protects the user. Approximately 70% of the air from each cycle is recirculated through the supply HEPA filter while the remaining air is discharged from the biosafety cabinet through the exhaust HEPA filter.