To activate a foam type portable fire extinguisher, you must __________.

Correct Answer: Option A — turn the extinguisher upside down

Traditional foam extinguishers often utilize an internal acid-soda reaction. Inverting the extinguisher allows the internal chemical components to mix, creating the pressure necessary to expel the foam through the nozzle. Modern crew must be trained on the specific operation of all extinguishers found on their vessel.