2007-02-06 09:12:12 · 2 answers · asked by mark t 1 in Business & Finance ➔ Other - Business & Finance
If you are talking about their "rating" that's determined by UL (Underwriters Laboratory) not NFPA.
For example: 4A:60B:C is a UL classification. Where A, B, and C refer to the class of fire the unit is rated for and the numbers represent the size of fire the unit is rated to extinguish.
2007-02-07 08:32:43 · answer #1 · answered by todvango 6 · 0⤊ 0⤋
Fire extincuishers are not tes fired to determine their classification. Their classification is based upon waht type of fire the extinguisher is able to put out. For instance: Class A is for Wood, Paper, etc: Class B is for Electrical (I think); Class C is for liquid (if memory serves me); and Class D is for burnable metals, etc.
Fire extinguishers are test fired only to determine their functionality, not their classification.
2007-02-06 09:25:54 · answer #2 · answered by krodgibami 5 · 0⤊ 0⤋