What is the difference between primary, intermediate and high efficiency filters? What is the replacement cycle of air filters?

What is the difference between primary, intermediate and high efficiency filters? How long is the replacement cycle of air filters? The main difference between the primary filter, medium and high efficiency filters lies in the filtration efficiency and the different uses, functions, materials, speed, different filters, the function may be a little different, in the multi-stage filtration system using both the primary and secondary filters and high efficiency filters, the primary filter is designed to alleviate the filtration pressure of the medium efficiency filter, while the primary filter, the medium efficiency filter is designed to alleviate the pressure of high efficiency filters and improve the service life of high efficiency filters, because, the price of the high efficiency filter is far more expensive. Improve the service life of high-efficiency filters and set up, because the price of high-efficiency filters is much higher than the primary and intermediate filters. Here we take a look at the primary filter, intermediate filter, high-efficiency filter features and replacement cycle: Primary filter: the primary filter of the air conditioning system, mainly used for filtration of dust particles more than 5 μ m, the primary filter has a plate, folding type, bag type three. Primary filter...