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. |
Instrumentation | ||
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 |