Recharge should be done by a certified Fire Extinguisher Service Company local to you. The Fire Extinguisher Service company will perform inspection and/or maintenance as required, dependent on the age of the Fire Extinguisher. To do this, check your favorite search engine for certified fire equipment dealers in your area.
After being used, even for just a small amount of time the fire extinguisher must be recharged and refilled (if the label says it is reusable). The fire extinguisher must not be expired as well. …. After being used once the fire extinguisher can lose all pressure and not be useful in the event that another fire occurs.
Where to Recharge Fire Extinguishers – First Alert
Below is a typical service procedure that should be completed by a factory trained and qualified fire extinguisher company in Peoria, Arizona for an Amerex Brand Fire Extinguisher No. 05602. (Amerex Owners Manual# 05602, Stored Pressure Dry Chemical Fire Extinguishers)
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How to Recharge an Extinguisher Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher