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Primary filters — also called pre-filters, coarse filters or G-class filters — are the first air-cleaning stage in an HVAC system, and their job is to...
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Air filters are mainly divided into three categories: primary efficiency, medium efficiency, and high efficiency, corresponding to different filtration needs. At the same time, these filters can also be used in combination to meet the air cleanliness requirements of different environments through a multi-layer filtration system. Through step-by-step filtration, it ensures that particulate matter and harmful substances in the air are effectively trapped, creating a fresh and healthy indoor air environment for users.

Primary filters — also called pre-filters, coarse filters or G-class filters — are the first air-cleaning stage in an HVAC system, and their job is to...
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