On a 20B(C) rating, the number represents the square footage of the fire that an average person can extinguish. A 20B-rated fire extinguisher is designed to handle a fire involving flammable liquids over an area of 20 square feet.
You mentioned that the Badger unit has a 30BC rating, as we can see here
This means that the Badger unit is rated to extinguisher a 30sqft fire, compared to the Buckeye being rated for a 20sqft fire.
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