The number on a fire extinguisher indicates the relative size of that extinguisher compared to others.
What the number means somewhat depends upon the type of fire extinguisher. The following information is specific to the USA:
Type A extinguishers are used mainly for paper and wood fires.
Number 1 indicates that the extinguisher has the fire-fighting ability of 1.25 gallons (4.7 liters) of water
Number 2 extinguisher has the fire-fighting ability of twice as much water,
number 3 has the fire-fighting ability of three times as much water, etc.
For Type B or Type B:C extinguishers, the number indicates the number of square feet of burning material that the typical user should be able to put out with the extinguisher.
Type B extinguishers are designed to put out burning liquids and gases, but not where there is electrical equipment
Type B:C extinguishers are for putting out electrical fires as well as burning liquids and gases. For example, a typical modern dry-chemical extinguisher might be rated 3-A:40-B:C. This means that on burning paper or wood, it will be as effective as 3.75 gallons (14 liters) of water. It can be used to extinguish burning liquids and gases even where there is electrical equipment present, as long as the burning area doesn't exceed 40 square feet, roughly 6 feet (2 meters) long and wide.
The bigger the number, the bigger the fire you can put out. If an entire room (or more) is burning, it's time to forget about the fire extinguishers and escape; you need professional firefighters!
Relative size
What the number means depends upon the type of fire extinguisher. The following information is specific to the USA:
Type A extinguishers are used mainly for paper and wood fires.
Number 1 indicates that the extinguisher has the fire-fighting ability of 1.25 gallons (4.7 liters) of water
Number 2 extinguisher has the fire-fighting ability of twice as much water,
number 3 has the fire-fighting ability of three times as much water, etc.
For Type B or Type B:C extinguishers, the number indicates the number of square feet of burning material that the typical user should be able to put out with the extinguisher.
Type B extinguishers are designed to put out burning liquids and gases, but not where there is electrical equipment
Type B:C extinguishers are for putting out electrical fires as well as burning liquids and gases. For example, a typical modern dry-chemical extinguisher might be rated 3-A:40-B:C. This means that on burning paper or wood, it will be as effective as 3.75 gallons (14 liters) of water. It can be used to extinguish burning liquids and gases even where there is electrical equipment present, as long as the burning area doesn't exceed 40 square feet, roughly 6 feet (2 meters) long and wide.
The bigger the number, the bigger the fire you can put out. If an entire room (or more) is burning, it's time to forget about the fire extinguishers and escape; you need professional firefighters!
LETTER- type of fire it will extinguish
NUMBER- capacity. Higher the number, the bigger the fire it can extinguish.
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the type of fire it is designed to extinguish <><><> Extinguishers can be class A,B,C,D or K- as said- the type of fire it will extinguish. A type B fire involves burning liquids, such as gasoline, paint, etc.
Class B fire extinguishers are for fires of flammable liquids (grease, gasoline, oil, propane, paints). The numerical rating of "1" signifies the the number of square feet of the flammable fire that a non-expert could expect to put out.So, a B1 extinguisher will help put a flammable material fire on only one (1) square foot before it runs dry.
LETTER- type of fire it will extinguish NUMBER- capacity. Higher the number, the bigger the fire it can extinguish.
The B determines the type of fire that can be extinguished, and in this case it would be flammable liquids such as gasoline, grease, oil, diesel fuel, and kerosene. The number indicates the approximate number of square feet the unit can extinguish, so a B-1 would be a relatively small extinguisher.
The B determines the type of fire that can be extinguished, and in this case it would be flammable liquids such as gasoline, grease, oil, diesel fuel, and kerosene. The number indicates the approximate number of square feet the unit can extinguish, so a B-1 would be a relatively small extinguisher.
The B determines the type of fire that can be extinguished, and in this case it would be flammable liquids such as gasoline, grease, oil, diesel fuel, and kerosene. The number indicates the approximate number of square feet the unit can extinguish, so a B-1 would be a relatively small extinguisher.
roman numerals indicate a number not a letter as such there is no answer to that question
A classroom would generally contain only "ordinary combustibles", so a type A fire extinguisher would be appropriate. In a chemistry laboratory, cooking class, automobile engines, electrical or welding class, different rules would dictate the type, placement and number of required fire extinguishers, typically Type ABC (multi-class).
All extinguishers should be professionally inspected annually. Call your local fire department business number for advise on finding a reputable local inspector. Refilling or recharging should be done by, and on the advice of, a professional.
Such a shop probably has flammable or combustible liquids and gases, meaning a Class B (ABC or BC) extinguisher is needed.The size and number varies according to the hazard level, but there should be one extinguisher within 30 feet of any point in the shop.NFPA 1 has tables for calculating the size required for each hazard level.
The B determines the type of fire that can be extinguished, and in this case it would be flammable liquids such as gasoline, grease, oil, diesel fuel, and kerosene. The number indicates the approximate number of square feet the unit can extinguish, so a B-1 would be a relatively small extinguisher.