To replace a foam extinguisher, consider these options based on the class of fire hazard you need to address [1]:

• Class A Hazards: For ordinary combustibles like wood and paper, you can use water, loaded stream, or multipurpose dry chemical extinguishers 1, 4.
• Class B Hazards: For flammable liquids and gases, suitable alternatives include Halon 1301, Halon 1211, carbon dioxide, dry chemicals, or loaded stream extinguishers 1, 4.
• Class C Hazards: When dealing with energized electrical equipment, Halon 1301, Halon 1211, carbon dioxide, or dry chemical extinguishers are appropriate because they are non-conductive 1, 4.

It's important to select an extinguisher that matches the specific fire hazards present in your workplace [1].