Specification Brand : FAST SHIPPED FILTERS BulletPoint1 : 3 Pack Replacement Filter Pads Designed to fit with Bioligic3 Air Cleaner Frame Size 21x21x1 BulletPoint2 : Actual Filter Size 19.5"x18.5" BulletPoint3 : Activated Full Carbon Center / Ozone free / Made in USA BulletPoint4 : Replace Every 1 to 4 Months: Depending Local air quality for optimal performance. BulletPoint5 : CAUTION: Do not place order using the measurement of disposable fiberglass pad. Measure the outside frame or refer to filter label inside plastic channel. BulletPoint6 : The products advertised on this page are manufactured by Fast Shipped Filters. BulletPoint7 : Fast Shipped Filters is a family-owned business in Swanton, Ohio that has been in the Heating Cooling & Air Purification industry since 1984 Color : Blue ControlMethod : touch ExternallyAssignedProductIdentifier : 6154557023044 FilterType : Fiberglass FloorArea : 1 IncludedComponents : 3 Pack Replacement AIr Cleaner Filters ItemName : Fast-Shipped-Filters 3 Pack 21×21 Replacement Filter Pads Compatible with Biologic3 Air Cleaner 21×21 Refill Blue ItemPackageDimensions_Height : 6 inches ItemPackageDimensions_Length : 16 inches ItemPackageDimensions_Width : 16 inches ItemTypeKeyword : electrostatic-filter-air-purifiers ItemTypeName : Replacement Filters Manufacturer : Fast-Shipped-Filters ModelName : 21x21 BA3 ModelNumber : 21x21 BB3 NumberOfItems : 3 PartNumber : 21x21 BB3 PowerSourceType : ac ProductDescription : 3 Pack Replacement Filter Pads Designed to fit with Biologic3 Air Cleaner Frame Size 21x21x1 ProductSiteLaunchDate : 2024-07-09T07:00:00.000Z Size : 21x21 Air Cleaner Size SupplierDeclaredDgHzRegulation : unknown Wattage : 1.4