Figure 2 shows the basic principles of the unidirectional flow room. High efficiency filters are installed across a whole ceiling (or wall in some systems) and these supply air. This air sweeps across the room in a unidirectional way at a speed of around 0.4 m/s (80 ft/min) and exits through the floor, thus removing the airborne contamination from the room. This system uses more air than the turbulently ventilated cleanroom but, because of the directed air movement, it minimises the spread of contamination about the room and sweeps it out through the floor.
Clean air devices, such as unidirectional benches or isolators, are used in both turbulently and unidirectional ventilated cleanrooms. These machines will give a localised supply of filtered air and enhances air conditions where required, e.g. at the area where the product is open to contamination.
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