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Work Stations

Laminar Air Flow Bench(LAF)

Laminar Flow Cabinets create particle-free working environments by projecting air through a filtration system and exhausting it across a work surface in a laminar or uni-directional air stream. They provide an excellent clean air environment for a number of laboratory requirements.

Uses

Laminar Flow Cabinets are suitable in the following sectors.

  • 1. Pharmaceutical industries
  • 2. Hospitals
  • 3. Diagnostic & Pathological labs
  • 4. Bio-chemical Research labs
  • 5. Scientific Research & Development Institutes etc.

How They Work

The process of laminar air flow can be described as airflow where an entire body of air flows with steady, uniform velocity.

Laminar Flow Cabinets work by the use of in-flow laminar air drawn through one or more HEPA filters, designed to create a particle-free working environment and provide product protection. Air is taken through a filtration system and then exhausted across the work surface as part of the laminar flows process.

Commonly, the filtration system comprises of a pre-filter and a HEPA filter. The Laminar Flow Cabinet is enclosed on the sides and constant positive air pressure is maintained to prevent the intrusion of contaminated room air.

Types of Laminar Flow Cabinets

Laminar Flow Cabinets can be produced as follows.

  • • Vertical Laminar Flow Cabinets
  • • Horizontal Laminar Flow Cabinets

Horizontal Laminar Flow Cabinets

Horizontal Laminar Flow Cabinets receive their name due to the direction of air flow which comes from above but then changes direction and is processed across the work in a horizontal direction. The constant flow of filtered air provides material and product protection.

Vertical Laminar Flow Cabinets

Vertical Laminar Flow Cabinets function equally well as horizontal Laminar Flow Cabinets with the laminar air directed vertically downwards onto the working area. The air can leave the working area via holes in the base. Vertical flow cabinets can provide greater operator protection.

Specifications :

Cleanliness Class 100 (FEDERAL 209E) / ISO5 (ISO 14644)
Air Velocity 0.30 ±20% m/s (for Vertical type) or 0.45 ±20% m/s (for Horizontal type)
HEPA Filter 99.97 % efficiency down to 0.3 μm particles
Pre-Filter 95 %efficiency down to 0.5 μm particles
Direction of Flow Horizontal / Vertical
Material of Construction MS Powder Coated/Stainless Steel 304
Work Table SS 304
Front Sash 5 mm thick polycarbonate- folding facility
Blower centrifugal type
Light fluorescent tube , UV lamp
Differential Pressure 0-25 mmWC
Noise Level 65 ± 5 dBA
Power Supply 220-230 V,50 Hz.
Other Accessories power point socket , gas inlet fixture, castor wheels

Bio-Saftey Cabinet

Biological Safety Cabinets safeguard users, materials and the environment from aerosol hazards and other types of environmental contamination.

Uses

They are utilized by a wide range of scientific, research and development organizations within both the commercial and non-commercial sectors, including pharmaceutical, medical, clinical research, defense, education and general healthcare sectors.

Classes and Characteristics of Biological Safety Cabinets

There are three classes of BSC: Class I, Class II and Class III. Selection of the proper class of BSC requires careful evaluation of the activities to be carried out. Laminar Flow Cabinets or other clean benches that direct air towards the operator are not biological safety cabinets and must not be used for handling infectious, toxic or sensitizing materials.

Class I Cabinets

These cabinets have non-recirculated airflow away from the operator that is discharged to the atmosphere after filtration through a HEPA filter. They provide good operator protection but do not protect the product within the cabinet from contamination.

Class II Cabinets

Class II cabinets are designed for personnel, product and environmental protection. They are designed for work involving microorganisms and are divided into two types (A and B) on the basis of construction type, airflow velocities and patterns, and exhaust systems(4).

Within type (A), there are two subtypes, A1 (formerly designated type A) and A2 (formerly designated type B3). Within type (B), there are two subtypes, B1 and B2. Class II cabinets are most commonly used in biomedical research laboratories because of their characteristics.

Class II, Type A1 Cabinets

  • Cabinet air may be recirculate back into the laboratory or ducted out of the building by means of a "thimble" connection (i.e., a small opening around the cabinet exhaust filter housing) whereby the balance of the cabinet is not disturbed by fluctuations in the building exhaust system. The thimble must be designed to allow for proper certification of the cabinet (i.e., provide access to permit scan testing of the HEPA filter).
  • Maintain a minimum average face velocity of 0.38 m/s (75 ft/min).
  • May have positive pressure contaminated ducts and plenums.
  • Are not suitable for work with low levels of volatile toxic chemicals and volatile radionuclide’s.
  • Class II, Type A2 Cabinets

  • Cabinet air may be recirculate back into the laboratory or ducted out of the building by means of a "thimble" connection (i.e., a small opening around the cabinet exhaust filter housing) whereby the balance of the cabinet is not disturbed by fluctuations in the building exhaust system. The thimble must be designed to allow for proper certification of the cabinet (i.e., provide access to permit scan testing of the HEPA filter).
  • Maintain a minimum average face velocity of 0.5 m/s (100 ft/min).
  • Have ducts and plenums under negative pressure.
  • Is suitable for work with minute quantities of volatile toxic chemicals and trace amounts of radionuclides.
  • Class II, Type B1 Cabinets

  • Hard-ducted through a dedicated duct exhausted to the atmosphere after passage through a HEPA filter; contain negative pressure plena.
  • Maintain a minimum average face velocity of 0.5 m/s (100 ft/min).
  • Recirculate 30% of the air within the cabinet.
  • Suitable for work with low levels of volatile toxic chemicals and trace amounts of radionuclide.
  • Class II, Type B2 Cabinets

  • Does not recirculate air within the cabinet.
  • Maintain a minimum average face velocity of 0.5 m/s (100 ft/min).
  • Hard-ducted through a dedicated duct exhausted to the atmosphere, 100% of cabinet air, after passage through a HEPA filter; contain negative pressure plena.
  • Suitable for work with volatile toxic chemicals and radionuclide’s.
  • Class III Cabinets

    Class III cabinets are totally enclosed and gas-tight with HEPA filtered supply and exhaust air. Work is performed with attached long-sleeved gloves. The cabinet is kept under negative pressure of at least 120 Pa and airflow is maintained by a dedicated exterior exhaust system. Class III cabinets protect the worker and the product. The exhaust air is double HEPA filtered or treated by HEPA filter and incineration. Removal of materials from the cabinet must be through a dunk tank, double door autoclave or air-lock pass-through for decontamination.

    Typical Specifications :
    Cleanliness Class 100 (FEDERAL 209E) / ISO 5 (ISO 14644)
    Down flow Velocity 0.30 ±20% m/s
    In flow Velocity Min 0.5 m/s
    HEPA Filter 99.97 % efficiency down to 0.3 μ particles
    Direction of Flow Vertical
    Material of Construction MS Powder Coated/Stainless Steel 304
    Work Table perforated 18 SWG thick SS 304
    Front Sash 5 mm thick polycarbonate sheet- folded
    Blower High efficient centrifugal type
    Light 15W fluorescent tube , UV lamp
    Differential Pressure 0-25 mmWC
    Noise Level 65 ± 5 dBA
    Power Supply 220-230 V,50 Hz.
    Other Accessories power point socket , gas inlet fixture, castor wheels

    Sampling & Dispersing Booth

    Dispensing / Sampling booths

    Dispensing / Sampling booths are used for filling, refilling, weighing & sampling of Raw material & Components

    Booths are designed to give mixed air flow stream for product, operator and environmental protection and used to control the hazardous emissions of dust powder during powder dispensing / sampling process. 0.3 micron downward air stream deflects air-borne dust away from the operator breathing zone which is caused in handling operation. Dust particle available is being filtered at three levels of filtration prior to being circulated back to the booths air stream. It is applied for fine filtration in air conditioning & ventilation system, suction air filtration in compressors etc.

    Specifications
    Description Specifications
    Type Front Open
    Direction of flow Vertical
    Material of Construction SS304 / MS Powder Coated
    Cleanliness Class 100 (US FED STD 209E) / ISO 5 (ISO 14644)
    Particle Retention 0.3 micron & Above
    Noise Level 65dB on On Scale 'A' ± 5
    Velocity 90 FPM ± 20%
    Illumination Flourescent tubes diffusers
    Pressure Differential 0-25 mm inclined Manometers / Magnehelic Guage
    Power Supply 230V Single Phase, 50 Hz
    Pre-Filters 10 - 15 micron rating, 3-Layers of HDPE mesh, 6mm Pressure Drop
    Intermediate Filters 3 micron & above, two layers of HDPE woven mesh and one layer of Non-woven polyester Bondex Media, 9 mm Pressure Drop, Efficiency 97%
    Supply HEPA Filters 99.97% efficiency @ 0.3 micron ratiing
    Exhaust HEPA Filters 99.97% efficiency @ 0.3 micron ratiing
    Blower Assembly Statically & Dynamically balanced DIDW type blower system
    Special Features

  • Designed in accordance with WHO-GMP
  • 3-Stage Filteration like Prefilter , Fine Filter , HEPA filter
  • Heavy duty Low noise motor blower assembly
  • Suitable to accommodate to floor & table balances
  • Fume Hood

    A fume hood is a type of local ventilation device that is designed to limit exposure to hazardous or noxious fumes, vapors or dusts. A fume hood is typically a large piece of equipment enclosing five sides of a work area, the bottom of which is most commonly located at a standing work height.

    Fume Hood is available in 4', 5', 6' and 8' widths

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