In order to ensure clean room (plant) within the control of dust particles in the clean room (plant) level of cleanliness within the required number of particles, usually in the air conditioning system using three or four filters, including early effect of the filter plate, medium efficiency bag filter, sub-efficient box filter or chemical filters to block cut filter into the clean room (plant) stream of dust particles or acid and other special gases, odors.
The bag filters used in air conditioning system , according to the filtration efficiency is divided into two ,namely primary filter, medium efficiency filters.
Early effect of the air filter dust was mainly targeted at greater than 10um dust, its counting efficiency (for 0.4um dust particles) is less than 40%, the air resistance is less than 50Pa.
Medium efficiency filters filter out mainly targeted 1 ~ 10um dust particles, which counting efficiency (for 0.4um particle size of the dust particles) of 40% to 95%, the air resistance is less than 100Pa.
The air filters used in clean air conditioning system,when the system design, the filter according to the nominal levels of air flow, air resistance and filtration efficiency portfolio selection. Meanwhile in the early effect filters and filtration efficiency filters are based on air flow and filter filtration rate to determine the size of the filter.
In the air filter mix to the early, middle and high three air filter combination approach is generally used 100000-1000000 clean room, for 10000-100 clean room, its air conditioning system is also used at the beginning, middle, middle and high four air filter combinations, or use the early, middle and sub-efficient, high four filter combinations. In four of the air filter combination, increase efficiency or third level of sub-efficiency air filters are designed to improve the purification of the air conditioning system cleanliness and prolong the life of the air filter end, reducing its replacement times.
