The most common material used dry chemical fire extinguishers is ammonium phosphate (with some ammonium sulfate). These agents can cause health effects associated with inhalation and include upper respiratory irritation with such symptoms as coughing or discomfort in the chest.
Nasal irritation and throat irritation such as a cough or discomfort in the chest are the result of breathing the powder or the dust. Those with medical conditions such as asthma may experience respiratory difficulty after exposure to dry compounds in fire extinguishers.
Fire Extinguisher Safety – Poison
Proper use of fire extinguishers is generally safe; however, there is some risk for mild respiratory, skin, or eye irritation. Breathing in fire extinguishing powder can produce serious toxicity and would require medical evaluation.
Is it bad to breath in fire extinguisher? Fire extinguisher powder inhalation is one of the biggest dangers with fire extinguishers. It is very irritating to mucous membranes and may cause difficulties with breathing if inhaled in large enough quantities. … Avoid inhaling and certainly stay away from ingesting quantities of the powder. Is it safe to have fire extinguisher at home? …
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher