Final answer:
Wet chemical extinguishers are specifically designed to control and extinguish fires in deep fryers. They create a thick soapy foam that cools the fire and prevents re-ignition. Proper application technique is crucial for effectiveness.
Step-by-step explanation:
The type of portable extinguishers specifically designed to control and extinguish fires in deep fryers are wet chemical extinguishers. Wet chemical extinguishers contain a potassium acetate solution that is effective in suppressing fires caused by cooking oils and fats. These extinguishers work by creating a thick soapy foam that cools the fire and prevents re-ignition.
Unlike other types of portable extinguishers, wet chemical extinguishers have a long discharge time and require a specific application technique. It is important to aim the extinguisher at the base of the fire, keeping a safe distance, and using a sweeping motion to control the flames.