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Aqua Fresh Refrigerator Water Filter WF490 Replacement Filter For Sub Zero 4204490

  • Filter Life: 6 Months
  • Filter Capacity: 750 Gallons
  • Helps reduce contaminants found in tap water and improves its quality
  • Helps reduce chlorine taste and odor
  • Fits Sub Zero Refrigerator

Compatible With The Following Refrigerator Models: 648PRO 648PROG BI30U BI30UG BI30UGO BI30UGSPH BI30UGSTH BI30UOLH BI30UORH BI30USPHLH BI30USPHRH BI30USTHLH BI30USTHRH BI-36F BI36FO BI36FOLH BI36FORH BI36FSPH BI36FSPHLH BI36FSPHRH BI36FSTH BI36FSTHLH BI36FSTHRH BI-36R BI-36RG BI36RGO BI36RGOLH BI36RGORH BI36RGSPH BI36RGSPHLH BI36RGSPHRH BI36RGSTH BI36RGSTHLH BI36RGSTHRH BI36RO BI36ROLH BI36RORH BI36RSPH BI36RSPHLH BI36RSPHRH BI36RSTH BI36RSTHLH BI36RSTHLH BI36RSTHRH BI36S BI36SO BI36SSPH BI36SSTH BI36U BI36UFD BI36UFDIDO BI36UFDIDSPH BI36UFDIDSTH BI36UFDO BI36UFDSPH BI36UFDSTH BI36UG BI36UGO BI36UGSPH BI36UGSTH BI36UIDO BI36UIDSPH BI36UIDSTH BI36UO BI36USPH BI36USTH BI42S BI42SD BI42SDO BI42SDSPH BI42SDSTH BI42SID BI42SIDO BI42SIDSPH BI42SIDSTH BI42SO BI42SSPH BI42SSTH BI42UFD BI42UFDIDO BI42UFDIDSPH BI42UFDIDSTH BI42UFDO BI42UFDSPH BI42UFDSTH BI48S BI48SD BI48SDO BI48SDSPH BI48SDSTH BI48SID BI48SIDO BI48SIDSPH BI48SIDSTH BI48SO BI48SSPH BI48SSTH IC18FI IC18FILH IC18FIRH IC24FI IC24FILH IC24FIRH IC24R IC24RLH IC24RRH IC30FI IC30FILH IC30FIRH IC30R IC30RIDLH IC30RIDRH IC30RLH IC30RRH IC36R IC36RIDLH IC36RIDRH IC36RLH IC36RRH ID24F ID24FI ID24FX ID24R ID27R ID30F ID30FI ID30FX ID30R ID30RP ID30RX ID36C ID36CI ID36CX IT30CI IT30CIIDLH IT30CIIDRH IT30CILH IT30CIRH IT30FILH IT30FIRH IT30R IT30RIDLH IT30RIDRH IT30RLH IT30RRH IT36CI IT36CIID IT36CIIDLH IT36CIIDRH IT36CILH IT36CIRH IT36R IT36RIDLH IT36RIDRH PRO 48




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Nominal Vs. Actual Sizes: Finding the Right Air Filter Size

Buying the Correct Size Air Filter- The Most Important Thing to Know 

When you are buying your air filter online most important thing to know is Air Filters have two sizes that you need to understand the Nominal size and the Actual Size. Not understanding these numbers often leads to consumers purchasing a filter that does not fit their Furnace or HVAC system.

Nominal vs Actual air filter size by Atomic

 

Understanding Nominal Filters Size Could Save You Time and Money

Not understanding the Nominal Filter Size is the primary culprit for incorrectly purchased filters.The Nominal Size are the usually the dimensions used to Label the filter. For instance 16x20x1. These dimensions are a rounded value on the filters actual measurements. The actual measurements on this filter may be 15.5x19.5x.75, but that could vary by brand and manufacturer. So in order to make sure you have the correct size filter, especially if you are replacing with a different brand it is important to confirm the actual size on the filter. When purchasing filters on the internet the Nominal size is usually found the in the product title.

Actual Filter Size- The Key to Making the Right Replacement Filter Purchase

The actual size as you might have guessed are the actual dimensions of the filter by length, width and thickness. This size is often on the filter right below the Nominal size and is usually labeled as the actual size. When you are buying a filter online the actual size is sometime in the product bullet point or the product description. If your filter does not have actual dimensions on the outside of the filter, you can measure you filter to get the correct dimensions. Some brands have a foam gasket on the outside of the filter, in this case you will want to make sure you have a compatible actual size size and that it also has the foam to insure a snag fit. 

Lennox Air Filter X0851 with Foam strips

Examples of Nominal and Actual Sizes

 Size  Example 1  Example 2
Nominal Size 20x20x1 16x20x1
Actual Size 19.5x19.5x.75 15.75x19.75x.75

 

 Furnace filters should fit securely but should not have to be forced into position. If you have to force the filter into its slot, then it is probably too big. Forcing an improper filter size in a filter can cause it to buckle, damaging the filter or reducing its ability to function properly. Filters are a smaller than their slot to allow for easy replacement. Some HVAC units may need a filter with dimensions that are unique or uncommon. In these cases, a custom filter needs to be ordered.

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