BIOLOGICAL SAFETY CABINETS

VERTICAL LAMINAR DOWNFLOW BIOLOGICAL SAFETY CABINETS


SRMC offers a wide range of Laminar Airflow Biological Safety Cabinets conforming to current ISO/TC, NSF/CDC/NIH standards and guidelines. Employing contemporary technologies in microcontamination control, these systems effectively provide both bioexclusion and biocontainment.

Here we describe the design that is in common use in the country. However, we do undertake manufacture of other categories against specific orders, including special design innovations for safe exhaust and safe removal of contaminated filters.

All SRMC units bear the hallmark of committed professionalism, and promise you quality, security, protection and full-value-for-money. Backed by rich experience, continuing research and strong infrastructure, SRMC’s cost-performance-benefit equations remain unequaled.

 

Choose SRMC and you can be sure you are investing in the best in the market.

 

 

VERTICAL LAMINAR DOWNFLOW BIOLOGICAL SAFETY CABINETS

Model

Work space dimensions

Overall dimensions

w

d

h

W

D

H

SRMC 2293-SM

36"

24"

32"

40"

32"

94"

SRMC 2294-SM

48"

24"

32"

52"

32"

94"

SRMC 2296-SM

72"

24"

32"

76"

32"

94"

 

Execution

Standard execution

Optional features

Typical applications

 

  • Composite melamine execution with antifungal painted interiors
  • SS work table with peripheral perforations
  • Front sliding sash with ports
  • Exhaust plenum
  • Exhaust HEPA filter
  • Inclined tube manometer

 

  • Built in sink with feed & drain fittings
  • UV germicidal lamp
  • Exhaust ducting & flanges
  • Air/gas cocks
  • Extra power outlets
  • Virus burn out unit (26Kw)
  • Magnehelic gauge
  • Ultra low noise blowers

 

  • Work involving infectious agents classified as 
    Risk Level 2

 

 

Special Components

Prefilter

Washable, reusable fire-retardant depth filter, specially treated to inhibit microfloral growth

HEPA filter

Microfibreglass media. Efficiency > 99.97% down to 0.3 m at both 100% & 20% of rated airflow

Impellers

Statically and dynamically balanced for high performance, low noise and vibration

Blower-motor

Direct-driven dual outlet design with special sealed bearings and unique suspension

 


CATEGORIES OF VERTICAL LAMINAR DOWNFLOW BIOLOGICAL SAFETY CABINETS


The Class I BSC

A. front opening
B. sash
C. exhaust HEPA
D. exhaust plenum


The Class II, Type A BSC

A. front opening
B. sash
C. exhaust HEPA filter
D. rear plenum
E. supply HEPA filter
F. blower


 

The Class II, Type B1 BSC (classic design).

Connection to building exhaust system required.

A. front opening
B. sash
C. exhaust HEPA filter
D. supply HEPA filter
E. negative pressure exhaust plenum
F. blower
G. additional HEPA filter for air supply

Note: The cabinet exhaust needs to be connected to the building exhaust.

The Class II, Type B1 BSC (bench top design).

Connection to building exhaust system required.

A. front opening
B. sash
C. exhaust HEPA filter
D. supply plenum
E. supply HEPA filter
F. blower
G. negative pressure exhaust plenum

Note: The cabinet exhaust needs to be connected to the building exhaust.

 

The Class II, Type B2 BSC.

Connection to building exhaust system required.

A. front opening
B. sash
C. exhaust HEPA filter
D. supply HEPA filter
E. negative pressure exhaust plenum
F. supply blower G. filter screen

Note:The carbon filter in the building exhaust is not shown. The cabinet exhaust needs to be connected to the building exhaust system.


The tabletop model of a Class II, Type B3 BSC.

Connection to building exhaust system required.

A. front opening
B. sash
C. exhaust HEPA filter
D. supply HEPA filter
E. positive pressure plenum
F. negative pressure plenum

Note: The cabinet exhaust needs to be connected to the building exhaust system.


The Class III BSC.

Connection to building exhaust system required.

A. glove ports with O-ring for attaching arm-length gloves to cabinet
B. sash
C. exhaust HEPA filter
D. supply HEPA filter
E. double-ended autoclave or pass-through box

Note: A chemical dunk tank may be installed which would be located beneath the work surface of the BSC with access from above. The cabinet exhaust needs to be connected to the building exhaust system.

 


Thimble unit for ducting a Class II, Type A BSC.

Note: There is a 1" gap between the thimble unit (D) and the exhaust filter housing (C), through which room air is exhausted.

A. balancing damper
B. flexible connect to exhaust system
C. cabinet exhaust HEPA filter housing
D. thimble unit
E. BSC

 


A bag-in-out filter enclosure allows for the removal of the contaminated filter without worker exposure.

A. filters
B. bags
C. safety straps
D. cinching straps
E. shock cord located in the mouth of the PVC bag restricts the bag around the second rib of the housing lip.

 


 

Tech-brief

Governing standards

ISO 14644 (1998), ISO 14698, NSF 49, BS 5726 Appendix A

Air velocity

90 fpm (0.45 mps) 20%

Cleanliness level

Fewer than 100 particles of size 0.5 m or larger per cu.ft of air sampled ( or <3,520/cuM )

Noise level

< 65 dB (A Scale)

Vibration level

< 2.5 m (0.0001")

Illumination level

800 lumens/sq m (75 ft-candles) at work surface

Electricals

230V AC, 1 f , 50 Hz

Annual Maintenance Contract.


1) AHUs, Cleanrooms, Laminar Flow work stations.
2) Largest inventory of air filters [20, 10, 5, 3 micron] pre filters and hepa filters.
3) Room differential pressure management.
4) Periodical testing & Validation of cleanrooms.