The serial number can be found in a black box after the word, "No." Note: In the example above, EX3622 is not a model number or serial number. It is the UL listing number. Find an extinguisher’s year of manufacture: The 4-digit manufacturing year can be found in a small box near the Underwriters Laboratory (UL) logo. Most fire extinguishers have a life expectancy of about 10 …
Fire Extinguisher. Serial number of fire extinguisher can be found near the base of the fire extinguisher itself. It may be a bit hard to read, so you may have to put it up against the light to see the number.
Model and Serial Number on Fire Extinguishers | Kidde
Where to Find the Model & Serial Number on Fire Extinguishers. The model number will be located on the label in the bottom right or left hand corner. It will say MODEL before it and give you a list of models. The serial number is located on the left hand side of the label under the words "UL Listed." It will consist of 2 letters and 6 numbers.
Where to Find the Model & Serial Number on Fire Extinguishers. . The model number will be located on the label in the bottom right or left hand corner. It will say MODEL before it and give you a list of models. The serial number is located on the left hand side of the label under the words "UL Listed."
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher