All buildings and structures are classified as follows:
A. Class “A” is any building or structure or any portion thereof which is moved on a motor truck or other vehicle propelled by its own power;
B. Class “B” is any building or structure or any portion thereof, not of Class “A” which is not more than sixteen (16) feet in width;
C. Class “C” is any building or structure or any portion thereof, not of Class “A” which is more than sixteen (16) feet and not more than twenty-two (22) feet in width;
D. Class “D” is any building or structure or any portion thereof, not of Class “A” which is more than twenty-two (22) feet and not more than twenty-eight (28) feet in width;
E. Class “E” is any building or structure or any portion thereof, not of Class “A” which is more than twenty-eight (28) feet and not more than forty (40) feet in width;
F. Class “F” is any building or structure or any portion thereof, not of Class “A” which is more than forty (40) feet in width.