| 摘要 |
<p>PURPOSE: To easily replace a filter element and to make it safe even when a bar or the like is inserted into it from a suction part by forming a filter element of a prefilter installed upstream of a main filter of a paper material having such a fiber diameter that pollen and spores are removed. CONSTITUTION: A prefilter 100 is installed upstream of a main filter 101. As a filter element of the prefilter 100, a paper material such as tissue paper having such a fiber diameter that pollen and spores are captured is used. As a result, not only pollen and spores can be captured, but also the effect of easily making maintenance and control of the filter element is obtained. Since pollen, spores or the like having severalμm or more particle diameter are captured upstream of an electric precipitator 3 in advance, the number of dust to be removed by the main filter 101 of the electric precipitator 3 is decreased to reduce the clogging of the main filter 101, and also the service life thereof is improved.</p> |
