How much larger is an I-Line style flush trim than the comparable surface trim?

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Issue:
What is the size of the outside trim?

Product Line:
Panelboards

Environment:
I-Line Power Distribution Panelboards

Cause:
Comparison flush and surface

Resolution:
The flush requirement adds 1.0" around the perimeter of the cover. This adds 2.0" to both the standard height and width.