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pro
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great question that I've wondered for years. All steel and fiberglass doors are 79" while wood doors are 80". My guess is that it has to do with the threshold. Steel doors can't be easily cut so they fit into a frame and a threshold prehung while wood doors used to be installed onsite knock down and threshold and copper weatherstripping custom fit on site and the door trimed to fit. Never quite figured it out myself.
 
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