Specification Brand : FAST SHIPPED FILTERS BulletPoint1 : 20x21.5 3 Pack compatible with Dynamic electronic air cleaner 20x21.5 replacement polarized filter pads refill Blue BulletPoint2 : Actual Filter Size 18.5"x19" BulletPoint3 : Filtration Technology: Activated FULL CARBON CENTER & Removes Orders, off gassing, Smoke, Dust Candle Soot and more / Ozone free / Made in USA BulletPoint4 : Replace Every 1 to 4 Months: Depending Local air quality for optimal performance. BulletPoint5 : For Commercial Quotes or Large Orders Contact us through Amazon 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 BulletPoint8 : Dynamic is a registered mark of Dynamic AQS. Fast-Shipped-Filters is not affiliated with Dynamic AQS. Color : Blue ControllerType : Button Control ControlMethod : touch ExternallyAssignedProductIdentifier1 : 0880561951740 ExternallyAssignedProductIdentifier2 : 880561951740 FilterType : Fiberglass FloorArea : 1 IncludedComponents : 3 Filters ItemName : Fast-Shipped-Filters 20x21.5 3 Pack compatible with Dynamic electronic air cleaner 20x21.5 replacement polarized filter pads refill Blue ItemTypeKeyword : electrostatic-filter-air-purifiers ItemTypeName : 20x21 filters Manufacturer : Fast-Shipped-Filters ModelName : 20x21.5 Dynamic ModelNumber : 20x21.5 D_Yx3 NumberOfItems : 3 PowerSourceType : ac ProductDescription : Fast-Shipped-Filters 20x21.5 3 Pack compatible with Dynamic electronic air cleaner 20x21.5 replacement polarized filter pads refill Blue ProductSiteLaunchDate : 2024-03-18T15:31:18.568Z Size : 14x24 Filters SupplierDeclaredDgHzRegulation : unknown