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Air Cleaning Equipment Dust Free Clean Room With ISO9001
More than a room that is clean or a controlled environment, a cleanroom is defined in the ISO standard 14644-1 as:
“A room in which the concentration of airborne particles is controlled, and which is constructed and used in a manner to minimize the introduction, generation, and retention of particles inside the room and in which other relevant parameters, e.g. temperature, humidity, and pressure, are controlled as necessary”
Minimizing the introduction, generation and retention of particles in a cleanroom is done in 3 ways:
Supplying the room with a large quantity of air filtered with high efficiency filters (HEPA filter or ULPA). The filtered air will dilute and remove particles, bacteria and chemicals from within the room. The air is also used to pressurize the room and ensure that no contaminated air flows into the cleanroom
The cleanroom itself must be built with materials that do not generate contaminants, particles, or outgas airborne chemical. The cleanroom must also be easy to clean.
Cleanroom operators must wear garments that minimize dispersion of particles and micro-organisms generated by people such as hair, skin flakes, clothing fibers, etc. In fact, operator base contamination accounts for 70% to 80% of cleanroom contamination. To minimize the risk of contamination, the clean room operators will usually get dressed in a gowning room, also referred as anteroom. Air showers can also be used.
Originally known as ‘turbulently ventilated’, the non-unidirectional air flow cleanroom receives clean filtered air through high efficiency air filters in the ceiling. The fresh air is mixed with the room air and removes airborne contamination generated by people and machinery. This process is done through air extracts positioned at the bottom of the wall. Depending on the industry as well as the cleanroom size, classifications up to ISO 6 can be achieved.
For higher and less stringent classifications such as an ISO 8 gray room, the air extracts can be positioned in the ceiling.
It’s a mistake to use the term laminar flow to describe this type of cleanroom. In physics and in engineering, laminar flow does not apply to the airflow of a cleanroom. Unidirectional airflow cleanrooms use much more air than non-directional airflow cleanrooms. High efficiency filters are installed across the entire ceiling.
The air sweeps down the room in a unidirectional way, at a velocity generally between 0.3 m/s and 0.5 m/s. It then exits through the floor, removing the airborne contamination from the room. For a room of less than a 4-6 meters width, air extracts can be positioned on the side of the walls.
The unidirectional cleanroom is more expensive than the non-unidirectional type. This is because it can comply
WHY WOULD YOU NEED A CLEANROOM?
Maximising product yield, improving quality control and ensuring safety are common reasons to use a cleanroom. Cleanliness is only one of the aspects controlled within a cleanroom. Cleanrooms can also control temperature, humidity, sound, lighting, and vibration when necessary.
The operations being conducted will determine which variables must be controlled. Here are some industries and applications that use cleanrooms:
Electronics, Semiconductors
Micromechanics
Optics
Nanotechnology
Biotechnology
Pharmaceutical
Sterile Compounding
Medical Devices
Food and Drink