Specification AcceptedVoltageFrequency : 100v_240v_50hz_60hz Brand : Enviroflow BulletPoint1 : Nominal Size 20 x 20 x 1. Actual Size 19.75 x 19.75 x 0.75 BulletPoint2 : MERV 8 Rated. Electrostatic pleated media, which performs better than regular fiberglass fibers. BulletPoint3 : Traps dust and allergens such as pollen, mold, pet dander, and dust mites. BulletPoint4 : Each filter lasts up to 90 days BulletPoint5 : Pack of 4 Filters BulletPoint6 : 6.Filter Lifespan: To maintain optimal filtration, check your filter every 6 months and replace it if dirty or airflow is restricted. Filters can last up to 1 year under normal use BulletPoint7 : 7.Why choose us? higher density materials than the original one, the filter reduced the faceguard from both sides, it increased dust holding capacity, you can use longer time and absorb better BulletPoint8 : 8.Consequences of Not Replacing: Failure to replace the filter in a timely manner can significantly reduce its filtration performance, affect the overall efficiency of the device, and lead to secondary pollution Color : 2-pack of 213 Air Filter ColorRenderingIndex : 32 CompatibleDevices : Furnace, Air Handler CompatibleDevices1 : Compatible with 2 types of standard machines: CompatibleDevices2 : (1) AC Nominal size: 20H x 25W x 4D (inches), actual size:20.24H x 25.4 Wx 3.77D (inches), it's a normal furnance filters. CompatibleDevices3 : (2) After installing the included frame, it fits for AirPurifier models 1210, 1620, 2120, 2200, 2210, 2216, 3210, 4200, and Space-Gard 2200 with Upgrade Kit 1213 ConnectivityTechnology : Normal bulb ControllerType : Push Button ControlMethod : application ExternallyAssignedProductIdentifier1 : 886566246515 ExternallyAssignedProductIdentifier2 : 0886566246515 ExternallyAssignedProductIdentifier3 : 00886566246515 GpsrSafetyAttestation : 1 IncandescentEquivalentWattage : 9 watts IncludedComponents : 4 Air Filters IndoorOutdoorUsage : indoor ItemName : Enviroflow 20x20x1 (19.75 x 19.75) Pollen and Dust Control (4 Pack) ItemPackageDimensions_Height : 50.165 centimeters ItemPackageDimensions_Length : 8.89 centimeters ItemPackageDimensions_Width : 50.165 centimeters ItemPackageQuantity : 1 ItemShape : Tubular(T) ItemTypeKeyword : air-purifier-replacement-parts LightColor : clear LightType : UV-C light Manufacturer : Enviroflow Material : Synthetic Fiber MinimumEfficiencyReportingValue : 8 ModelName : Enviroflow ModelNumber : KF20X20X1 NumberOfBoxes : 1 NumberOfItems : 4 PackageLevel : unit PartNumber : KF20X20X1 PowerConsumption : 9 watts PowerSourceType : AC adapter or DC power supply ProductDescription : The furnace air filter is compatible with 2 types of standard machines: (1) AC Nominal size: 20H x 25W x 4D (inches), actual size: 20.24H x 25.4 Wx 3.77D (inches), t's a normal HVAC AC furnance filters. (2) After installing the included frame, it fits AirPurifier Models: 1210, 1620, 2120, 2200, 2210, 2216, 3210, 4200, and Space-Gard 2200 with Upgrade Kit 1213 ProductGrade : new ProductSiteLaunchDate : 2015-05-04T21:37:51.735Z Size : 2 Count (Pack of 1) Style : 2-Pack 213 Replacement Filter SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredHasProductIdentifierExemption : 1 UnitCount : 4 UnspscCode : 40161505 Voltage : 60 volts WarrantyDescription : No. Wattage : 9 watts WebsiteShippingWeight : 0.726 kilograms