Rechargeable models must be serviced after every use. Following manufacturer's instructions, check the pressure in your extinguishers once a month. The Pass Word Stand 6 to 8 feet away from the fire and follow the four-step PASS procedure. If the fire does not begin to go out immediately, leave the area at once. Always be sure the fire department inspects the fire site.
Some extinguishers have other devices that prevent inadvertent operation.
This discharges the extinguishing agent. Releasing the lever will stop the discharge. Some extinguishers have a button that you press. Moving carefully toward the fire, keep the extinguisher aimed at the base of the fire and sweep back and forth until the flames appear to be out. Watch the fire area.