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What is your filter size?
Please enter your filter dimensions in inches. Ex: 18⅜ x 20½ x 1
| Length | Width | Thickness/Depth | ||
| & | X | & | X |
Learn More About Filer Sizing
Grille Size
HVAC filters are normally installed in a grille which houses the filter. The HVAC industry sometimes specify the filter by the standard industry filter grille size commonly referred to as the nominal size. However, the actual filter must be somewhat smaller than the grille to fit into the unit, therefore filter manufacturers will size the actual filter to fit the grille size specified. For example, your A/C unit may call for a 20” X 20” X 1” filter (grille or nominal). The manufacture may make a filter 19 ½” X 19 ½” x ¾” (actual size) which is an undercut from the nominal size.
Nominal Size
There is a list of industry sized filters that are generally considered to refer to the size of the filter grille installed by the manufacturer of your HVAC unit, these are the nominal sizes. Unless otherwise stated by the customer when ordering, filter manufacture will consider these sizes grille or nominal and will make a filter with dimensions ¼ to ½ inch less than the stated/nominal size.
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