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. AFLTR4LD FAN FILTER AND FINGER GUARD KIT
Low-density filter kit for 4-inch (102-mm) and 6-inch (152-mm) fans
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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