flat filter (the framework of the size can be customizde according to customer requirements) product description: type:flat filter(the framework of the size can be customized according to customer requirements) uses:coarse dust filter .air filter filtration system. large-scale air and out of air in public places. filtration level:G3 G4 F5 F6 F7 F8 filter:filter based on a different level and ...
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