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Generally for interior doors the RO (Rough Opening) is 2 inches wider than the door slab. This gives 3/4" for the jamb and 1/4" of 'play' for each side, for you to adjust the jamb to make the door operate properly. So if you've got 29 13/16 instead of 30, you'll end up with a little over 1/4 of play total instead of 1/2. Still should be plenty if your jacks ...

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