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What is Nominal Size?

Our website allows the visitors to filter for a specific Nominal Size. A nominal size or trade size for doors is a size "in name only" used for identification. The nominal size may not match any dimension of the door but within the domain of the door size. For example, a 2’/8” wide door can any of the followings:

  • 32”
  • 31-¼”
  • 31- ¾”

This is the actual door size & does not include the frame thickness. For Example, the above 32” wide door can be 33-½” (net frame size) once it is hung on a frame.  


The nominal size for the unit below is 47”x80” (3’11”x6’8”)


This is made of a 32"x80" and a 15"x80" sidelite. When you add these components, it will be a total of 47" x 80". However, the actual unit size for this unit is 48-1/2" x 81-3/4". The actual unit is the size of the unit after is it fully assembled with a frame.