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Three numbers on a Spectis crown plate tell you if the stick fits: projection, height, and length. This guide explains each one, gives a starting size for your ceiling or eave, and lists the sizing mistakes we see most often. It is written for homeowners, builders, and architects ordering crown for interior rooms or exterior cornice. Projection, height, and length Projection is how far the crown stands off the wall. A deep eave needs more projection than a bedroom ceiling. Height is how far it d …