For a clean room in operation, the value of the end-effect filter is not high, all add up to the user may not be a few hours of output, but the replacement of high-end filter risk and indirect costs will be high. Replace the filter to stop production, loss of production can only be calculated by the owners themselves, this loss is certainly higher than the cost of spare parts filter. Replacement of high efficiency filters is a very careful operation, clean room, anything can be expensive, damage to a component of its loss may be higher than the cost of all filters. After the filter to be replaced by professionals to detect, and sometimes even on the air conditioning system debugging, but also after a period of trial operation. Testing, commissioning, commissioning, three costs added together, may be comparable with the filter price. Smart owners always want to extend the useful life of the filter as much as possible, not to save the filter money, they want to avoid the trouble of replacing the filter. To extend the service life of high efficiency filter, *** the fundamental way is to block the dust in the pre-filter. Replacement of the pre-filter generally do not need to stop production, no debugging, so experienced owners will pay attention and money spent on the pre-filter and the protection level of the intermediate filter. For 10K and 100K clean room, pre-filter selection G4, intermediate can choose F8 filter (colorimetric 95%), so that the end of the high efficiency filter life of up to 5 years. In foreign projects and domestic new projects, F8 filter is a non-uniform flow of clean room *** common pre-filter. In some cases, the useful life of a high efficiency filter is not dictated by resistance, but rather by other factors. If the plant has hydrofluoric acid, and the workshop air conditioning is not a new air system, high efficiency filter in the glass fiber filter paper will be the return air corrosion, in order to be safe, regular replacement of high efficiency filter. Some large pharmaceutical plants, after the rainy season each year to replace the high efficiency filter, in order to prevent any possible mold contamination of the filter. Some biological laboratories and laboratories dealing with dangerous goods require a new high-efficiency filter for reliability before undertaking a new and important task.
