... as 190 CFM air flowing rate, this combo of Activated Carbon Air Filter & Vortex Inline Duct Blower , also short called ... the fidgets referred above.Features:Filter: 4" Flange Activated Carbon Charcoal Filter Maintenance Free Design Safe and Effective Operation Cotton ... equipment available, such as air filter, water filter, oil filter, carbon filter, acid filter, oil purifier, filter bag, bag filter, ...