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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 Filter Sizing
Grille Size
HVAC filters are normally installed in a grille/frame which houses the filter. The industry sometimes specifies the filter by the actual size of the grille (commonly referred to as the nominal size). However, the actual filter must be smaller than the grille to fit into the unit. For example, a 20” X 20” X 1” filter (grille/nominal size) will typically require 19 ½” X 19 ½” x ¾” (actual size) filter. This is sometimes referred to as an undercut.
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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