improvements to a portable fire extinguisher where the improvements relate to a system where the owner of the extinguisher can service and maintain their fire protection . systems in place today require the servicing of a third party . the service companies are charged with maintaining the system . further improvements include an anti - bridging mechanism that is articulated from the exterior of the chamber to fluff , mix or stir the powder within the chamber to keep it in a liquefied state . an external pressurized canister allows easier servicing or replacement of the pressurized canister as well as the ability to maintain the chamber in an un - pressurized condition , allowing non - hasmat shipping . these features extend the service intervals while maintaining the fire extinguisher in a ready condition . the fire extinguisher is construction of components that are interchangeable and provide equal operation for left and right handed people .