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The primary bag air filter is mainly used for filtering dust particles greater than or equal to 5µm in air conditioning systems to protect the secondary filter and prolong its service life. The secondary bag air filter is mainly used for filtering dust particles greater than or equal to 1µm in air conditioning systems to protect the sub-high efficiency or high-efficiency filter after it and prolong its service life. The common bag filter dimensions are 592×592, provided with 3~12 parallel bags.