You can order a fire extinguisher filling system online or buy one from a local fire safety supply company. If you used a chemical reclamation system, you can refill the extinguisher with the extinguishing agent that you took out during the cleaning process.
However, it’s possible for you to refill certain types of units by yourself but you need to stay concentrated. To refill a fire extinguisher, you have to unthread the valve, let the pressure escape, pour in suppression agent, pressurize the unit, add sealing grease, rethread the valve and add a …
Where to Recharge Fire Extinguishers – First Alert
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.
Fire extinguishers require service, maintenance, tests, inspections, annual service, (6) six year teardowns, refills and recharging that should be completed by qualified, factory authorized, certified fire extinguisher companies that are actively licensed in Newark, New Jersey.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher