Class II Biosafety cabinet – Type A1

  • Aeromech™ Class II Biosafety Cabinet Type A1 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 A1 cabinet, about 70% of air from the positive plenum is recirculated as downflow, and the remaining All Class II biological safety cabinets type A1 is suitable for work with microbiological agents assigned to biosafety levels 1, 2 and 3.
1 Product Class II Biosafety Cabinet –Type A1
2 Air balancing 70% recirculation.30% exhaust
3 Protection  Product & personnel & environmental protection
4 Cleanliness level ISO class 5 as per ISO 14644-1
5 Average Airflow Inflow Velocity
 Minimum 0.45 m/s ( 90 FPM) at 8” front opening
Velocity Down Velocity
 0.30 m/s ( 65 FPM)
6 Noise level 60 db on A scale
7 Light Intensity Minimum 900 lux inside the working area at ambient zero
8 MOC Main Body -  Galvanized Iron with PU coated / Stainless Steel – Satin Finish
Working Area - Stainless Steel IS 304 Grade Satin Finish
9 Supply Filter HEPA Filter having EU 13 rating with suitable size. .
Efficiency 99.99% down to 0.3 Microns.
10 Exhaust Filter HEPA Filter having EU 13 rating with suitable size. .
  Efficiency 99.99% down to 0.3 Microns.
11 Pre Filter Aeromech® make, EU 4 rating with suitable size.
Efficiency 90% down to 10 Microns.
12 Noise Level Less than 70 db 'A'.
13 Vibration Level Minimum.
14 Magnehelic Differential Pressure Gauge 01 No. (make : Dwyer, USA) with each unit  (To measure differential pressure across the supply HEPA filter).
15 Motor Blower Assembly Statically & Dynamically balanced with suitable rating and size.
(Induction motor with centrifugal blower) A Mounting unique spring suspension system to take care of vibration and noise.
16 3 Pins Switch & Socket 15 AMPS - 1 set in each unit.
17 Other Switches On/Off switches for motor blower & CFL lights.