Class A - Common combustibles (wood, paper, cloth, etc.) Class B - Flammable liquids and gases (gasoline, propane, and solvents) Class C - Live electrical equipment (computers, fax machines, etc.) Class D - Combustible metal (magnesium, sodium, potassium, etc.		Class K - Cooking media (cooking oils and fats)	WHEELED FIRE EXTINGUISHER TYPES Stored Pressure - Agent and pressurized gas are stored in the same cylinder for instant activation. Pressure Transfer - Pressurized gas is stored in a seperate cylinder for easier recharge, and transfered to the agent prior to discharge. Regulated Pressure - Pressurized gas transfers through a regulator into the agent cylinder for a constant pressure and complete discharge. Residual pressure is used to clear hose of any remaining agent.
		UL EXTINGUISHER RATINGS The number indicates the extinguisher's relative power against that class of fire. An extinguisher rated 2A is twice as powerful against common combustible fires as one rated 1A. Class C does not have a numerical rating.