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Clean Room with HVAC Systems

Clean room is an enclosed clean work space employing control over the particulate matter in the air with temperature, humidity and pressure control. All clean rooms must not exceed a particulate count as specified in the air.

We are all aware that the times are changing in Indian industries in all sectors have to gear up to meet the new challenges of changing time. The manufacturing practices of the past are no longer considered good enough. The quality standards are being revised constantly to meet Indoor Air Quality (IAQ)

The laminar air flow principle was introduced in clean room technology. This was considered to be the biggest revolution in clean room design engineering to maintain IAQ.

GENERAL REQUIREMENTS

  • Clean rooms to be built and operate in an area where particle generation levels are minimum.
  • Environmental control
  • Clean room air pressure
  • Air changes rate of air flow
  • Temperature range
  • Humidity range
  • Noise level
  • Vibration levels
  • Microbial Contamination
  • Other factors like lighting, internal equipment load, occupancy, electromagnetic radiation, radioactive particles, gases, vapors.

CLEAN ROOM DESIGN REQUIREMENTS

  • Area to be defined to built clean room space.
  • Entry ways
  • Ante rooms, change rooms
  • Air handling system with filtration
  • Clean room furniture’s, equipments
  • Clean room lighting and fire protection
  • Desired level of cleanliness.

Horizontal / Vertical Laminar Air Flow Bench

A clean work table with class 100 cleanliness level using HEPA filtered air circulation is called LAMINAR AIR FLOW BENCH

LAMINAR AIR FLOW BENCH is classified based on the air flow pattern. If the Airflow pattern is horizontally across the work table is called horizontal laminar air flow and if the air flow is vertically downwards on the work table surface is called vertical laminar air flow.

In both types principally the room air is taken through a pre filter which arrest larger size particle by which the life of HEPA filter increases. The pre filtered air is forced through HEPA filter, results a stream of unidirectional clean air flow within the work table surface of the work bench.

A nominal filter face velocity of 80 to 100 fpm ensures sufficient number of air changes in order to maintain desired cleanliness level. The filtered air moves out from the front open space of cabinet.

The LAF unit is constructed out of GI powder coated sheets & MS powder coated sections in combination with SS work table surface or alternatively all SS construction. The front shutter is of polycarbonate panel moves up and downwards with easy movement balanced by counter weight.

Pre filter & HEPA filter is provided with protective grill to prevent accidental damages. The supply air blowers are centrifugal, direct drive type, self lubricated, extremely low noise level and free from vibrations.

The unit is provided with white light, UV light, pressure gauge to monitor pressure across HEPA filter. The electrical switches to operate blower, lights are of superior quality and assures safety to operators. All units are factory tested before dispatch. The equipment designed for maximum chemical resistance, longer service life, durability and are clean room compatible.

The sizes as per work table size. The available standards are as under

  • 2 Ft. x 2 Ft.
  • 3 Ft. x 2 Ft.
  • 4 Ft. x 2 Ft.
  • 6 Ft. x 2 Ft.
  • 8 Ft. x 2 Ft.

Static Pass Box

A Pass Box is regulatory & mandatory in Clean room Standards for the transfer of work item in and out of the clean room to minimize air borne particles brought about by human traffic.

The application of pass box is for movement of small handy products. Generally pass boxes are mounted at 3’ – 0” level from the floor for convenience of operators.

Dynamic Pass Box

Pass boxes are used to move material from unclassified area to classified area are called dynamic pass box. All dynamic pass boxes are fitted with HEPA filtered air circulation system. All dynamic pass boxes are design to class 100 cleanliness level. Dynamic pass boxes are large by height to accommodate HEPA filtered air circulation system.

CONSTRUCTION

All pass boxes are tailor made to suit customer requirement. Combination of GI powder coated with SS and all SS construction is standard practice of manufacturing. Door interlocking, Buzzer, white light, UV light, hour running meter are standard accessories in pass box design.

Bio Safety Cabinet

Bio safety cabinets provides product, personal & environmental protection especially in micro biological work

Designed and manufactured as per NSF 49 of US standards. Suitable for microbiological work with agents assigned to bio safety level 1, 2,3 & 4.

  • BSL1 : Facility is comparatively safer labs where the reagents used or not potentially harmful either to researcher or to the environment. Thus, there are no specific HVAC criteria for these units.
  • BSL 2 : Deals with moderately hazardous agents
  • BSL 3 : Deals with dangerous or exotic reagents which are harmful.
  • BSL 4 : Facility critical where the material dealt which can cause life threatening diseases.

The equipment incorporates HEPA filters of minimum efficiency 99.997% down to 0.3 micron with backup filters. In principally these cabinets are under negative pressure with respect to labs. The blower draws air from the lab area through the opening provided below the operators arm rest panel which is slightly above the work table surface through HEPA filters and 30% of air is exhausted out from the cabinet to the lab area or outside depending on the contamination level. Due to this principle the cabinet will be always under negative pressure. This ensures required to operator.

The 30% air exhaust will be let into the lab in BSL 1 system, exhausted to outside ambient in BSL 2 system, exhausted through burnout chamber in BSL 3 systems and in BSL 4 systems it is 100% exhaust through burnout chamber.

All cabinets are GI powder coated & SS sheet combination & alternatively all SS construction. The front shutter is of sliding type with polycarbonate panel ensures easy & smooth movement by counter weight. Accessories like UV light, white light, gas cock, door buzzer are provided as standard features. Two pressure gauges will be provided to monitor cabinet negative pressure & HEPA filter pressure. Permanently lubricated, direct drive centrifugal blowers having extremely low noise & vibration level. All components are designed for maximum chemical resistance, longer & safer life, durable & clean room compatible. The following are the standard manufacturing sizes.

  • 3 ft. x 2 ft.
  • 4 ft. x 2 ft.
  • 6 ft. x 2 ft.

Air Shower

Air shower is self contained equipment designed to provide high velocity HEPA filtered air through air jets/ nozzles located inside shower area to prevent dust, contaminates carried through apparel worn by person entering into High precision clean room.

High precession clean room activity recommends an AIR SHOWER for people entering into clean room. This is to prevent dust, contaminates carried through apparel worn by operators. Air shower is self contained equipment designed to provide high velocity HEPA filtered air through air jets / nozzles located inside shower area. Air shower is provided with two electrically interlocked doors for entry & other for exit. All persons entering critical clean room shall pass through air shower & stay inside the shower area for a preset duration. Dust particles settled on the protective clothing worn by person are removed by the high velocity air jets & this helps the desired conditions to maintain inside clean room.

Air showers are generally custom designed to suit site conditions, depending upon the space availability. Air showers can be vertical or horizontal construction. All air shower design offered by SLV Enterprises , confirms is IS 14644/ US FED 209 E standards. It is available in both GI powder coated & SS construction. All Air showers are designed to meet class 100 cleanliness level.

Dispensing Booth and Sampling Booth

Clean environment of a higher level of cleanliness within a confined area for Sampling and Dispensing activity to prevent outdoor / external contaminates.

Generally used by all pharmaceutical companies when raw material needs to be sampled and dispensed within a clean environment. They are designed to provide operator and products protected from outdoor or external contaminations. The equipments designed in accordance with US FED 209 E standards. The equipment construction with SS 304 sheets. The lighting is provided on both side panels ensures shadow less lighting through the booth.

The room air taken by a slotted air grill located at low level inside the booth with pre filter down to 5 micron and larger size particle. The filtered air is forced through a HEPA filter which creates a laminar floor effect of clean air on the work table surface to ensure required cleanliness level to meet the process.

Separate electrical power switches is provided for supply air blower & lighting, additional power socket is provided inside to connect weighing scale. A megnehellic pressure gauge is provided to monitor the pressure drop across the HEPA filter. It is also constructed using epoxy powder coated galvanized sheets depending on the user specification. The general standard sizes are 4’x2’ & 6’x2’. It can also be made according to users requirement