🔍 Key Concepts

• Cartridge-operated extinguishers use a separate gas cartridge to pressurize the main cylinder when activated. • Look closely at the discharge hose and nozzle design – CO₂, foam, and dry chemical usually have different nozzle shapes. • Consider the agent inside the main cylinder as shown in the cutaway: does it look like liquid, gas, or powder?

💭 Think About

• From the illustration, what clues tell you that the propellant gas is stored separately from the extinguishing agent? • Based on the nozzle and hose shown, which type of extinguisher (foam, CO₂, or dry chemical) would most commonly use that style of discharge equipment? • Does the interior of the shell look more like a tank holding compressed gas, a liquid solution, or a loose powder that would be blown out by the cartridge pressure?

✅ Before You Answer

• Confirm that the unit clearly shows a separate gas pressure cartridge mounted on the side. • Note whether the nozzle looks like a horn for CO₂ or more like a standard spray nozzle for liquids/powders. • Make sure the internal agent appearance (in the cutaway) is consistent with powder vs. liquid vs. gas before choosing.