Fire extinguisher with internal mixing and gas cartridge

A portable fire extinguisher including a chamber configured to be filled with a fire suppressant material and to be pressurized with gas from an inverted compressed gas cartridge, the portable fire extinguisher further including a flow path for releasing the fire suppressant material from the chamber, the portable fire extinguisher comprising:

• an externally accessible fluffing mechanism having a rotatable central shaft fluidly coupled at a first end to the flow path and having a second end disposed inside the chamber;
• at least two fluffing arms fixedly attached to the rotatable central shaft within the chamber and configured to agitate the fire suppressant material in the chamber when the rotatable central shaft is rotated, the at least one fluffing arm extending radially away from the central shaft, wherein the fluffing arms are staggered along the length of the rotatable shaft without overlap;
• the at least two fluffing arms are each supported by a support gusset, the support gusset adapted to resist a force from a stream of pressurized gas applied to the fluffing arm where such force is applied parallel to the axis of the rotatable central shaft, the support gusset coupled to the rotatable central shaft and to a fluffing arm, wherein the support gusset extends radially away from the rotatable central shaft inside of the chamber;
• and
• wherein at least one fluffing arm includes a top surface and a bottom surface that has a greater area than the top surface such that the fluffing arm has a tapered cross-section, the fluffing arm having a crowned structure.