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Fire-extinguishing ball may fail to actually extinguish fires, CPSC warns
Officials added that the balls do not have a pressure gauge or pressure indicator ... does not meet the requirements of UL 299 Dry Chemical Fire Extinguishers and UL 711 Rating and Fire Testing ...
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How to Use a Fire Extinguisher
Regulations by the National Fire Prevention Association (NFPA) require fire extinguishers to be inspected once a month, ...