PSI Class II Bio safety Cabinet Type A1 & A2 are 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 down flow. 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 down flow, and the remaining 

PSI Class II Type B1 Biological Safety Cabinets

The Class II Type B1 biological safety cabinet has a common plenum from which 70% of air is exhausted, and 30% re-circulated to the work area as the down flow.

Type B1 cabinets also have a dedicated exhaust feature that eliminates re-circulation when work is performed towards the back within the interior of the cabinet. Toxic chemicals employed as an adjunct to microbiological processes should only be employed if they do not interfere with work when re-circulated in the down flow.

PSI Class II Type B2 Biological Safety Cabinets

PSIClass II Type B2 cabinet all inflow and down flow air is exhausted after HEPA filtration to the external environment without recirculation within the cabinet. Type B2 cabinets are suitable for work with toxic chemicals employed as an adjunct to microbiological processes under all circumstances since no re-circulation occurs. In theory, Type B2 cabinets may be considered to be the safest of all Class II biological safety cabinets since the total exhaust feature acts as a fail-safe in the event that the down flow and / or exhaust HEPA filtration systems cease to function normally. However, Class II Type B2 cabinets are, in practice,difficult to install, balance and maintain.

• Product: -Class I Biosafety Cabinet
•  Air balancing: -0% recirculation.100% exhaust
• Protection:-personnel & environmental protection
•  MOC: - Galvanized Iron with PU coated / Stainless Steel – Matt Finish 
• Exhaust Filter: -HEPA Filter having EU 13 rating with suitable size
•  Efficiency: -9.99% down to 0.3 Microns
• Pre Filter:-EU 4 rating with suitable size
•  Efficiency:-90% down to 10 Microns
•  Inflow Velocity:-Minimum 100% from the front opening
•  Illumination Of Light:Optimum
•  Noise Level: -Less than 70 db 'A'
•  Vibration Level: -Minimum.Magnehelic Differential 
• Pressure Gauge:01 No. (Make: Omicron USA) with each unit 
• (To measure differential pressure across the supply HEPA filter).
•  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.
•  White Lights:Lights through white acrylic cover to get maximum light intensity
•  3 Pins Switch & Socket: - 15 AMPS - 1 set in each unit
•  Other Switches:On/Off switches for motor blower & CFL lights

Terms & Condition 

• Delivery: - 4 to 5 Weeks 
• Quotation Validity for: 60 Days
• Transportation: By Any Reputed Transporter – Road Transport.
• Freight: Extra As Applicable End, On To-Pay Basis.  
• Packing Charges: As Actual 
• Warranty: - One year any manufacturing defect On To & Fro Chargeable Basis + Accommodation
• Payment: - 40% Advance along with the order, 60% remaining against the Proforma
• Invoice prior to dispatch from our factory.
• GST: 18% GST Extra.
• GST No: 24AAICP4669F1Z8.
• Thanking you & Assuring you our best attention at all times.
• For, Patel Scientific Instruments Pvt Ltd
• Sanjay Patel (Director)