What are fire extinguisher ratings?
Jan 1, 0001
The numbers 1-10before the letter A represents the rating for that A capability, the higher the number the larger A class fire the unit can handle.
The numbers 10, 20,40,60,80 before the letter B represents the rating for the B capability, once again the higher the number the larger B class fires the unit can handle.
The letter C does not get a rating as the letter only signifies that the unit is electrically non-conductive.