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The numbers in grade name were USA ASD Fb values that did not equal Canadian fb values in MPa when converted from psi. The grade names were changed to reflect Canadian LSD design and nomenclature, for example 2200Fb is now 4065fb.
The Imperial value, rounded to the closest 5 lbs., was used for consistency with the "species" name, which is the Imperial modulus of elasticity value such as 1.2E.
Note that grade values from old projects will not be selected in Sizer, and must be reselected manually.