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Can you substitute a ventilated trim front for a non-ventilated trim front of the same size or vice versa on an NQOD panel?

No. The ventilated trim fronts are used on the 400A and 600A panels. These trims mount to the flange of the box using tinnerman clips and screws. The non-ventilated trim fronts are used on the 100A and 225A panelboards and fasten to the deadfront of the interior using screws only.

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