Low-density grille and filter kit that can also be used as vent. Filter is removable and can be cleaned and reused. Mounting hardware included. AFLTR6LD FAN FILTER LOW DENSITY
Low-density filter kit for 4-inch (102-mm) and 6-inch (152-mm) fansCan also be used as vent. Filter is removable and can be cleaned and reused
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Primary Spec Sheet
https://static.graybarcanada.com/Generic/xml_nvent/pdf/documents/740fe9b3624e9255322e7d4cc951e2779710adbc.pdf
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Spec Sheet
https://static.graybarcanada.com/Generic/11015_zhyo0ngxte9v1wmc.pdf