Filtration of supply air is valuable but, it should be noted that good quality filtration is not, of course, by itself a guarantee of clean conditions within the space. Other factors are the processes involved the occupants, materials and the manner of air distribution. The filters merely prevent the particulate from entering the controlled space through the fresh air supply and re-circulation system. There is an increased interest in developing food products that will have a longer shelf life without the addition of additives and preservatives. Some of these items are required.
Food safety is a primary goal of improving the manufacturing environment.
There has been a tradition of horizontal flow approaches for the large craft normally being assembled within the controlled area. These horizontal flow techniques are effective at delivering large flows of HEPA filtered air across tall or large hardware. A horizontal flow facility is one in which the air supply is generated from one wall, flowing across the room to the opposite wall. The choices of facility configuration and airflow patterns are based on a number of considerations. The product to be protected plays a major role in these decisions.