How much pressure can a fire extinguisher hold? An extinguisher needs enough charge so that when it is discharged, there is an ample amount of dry chemical with a velocity sufficient enough to propel the chemical 10-20 feet. The range of a properly charged extinguisher is between 185-205 p.s.i. This value is displayed on the pressure gauge.
Portable fire extinguishers are most commonly used in homes and offices. This is equipment that can easily go unnoticed until a fire incident arises. You may assume that the unit is always ready and waiting to put off a fire during an emergency.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher