Be prepared for unexpected fires with the Mr Firefighter 4-in-1 Extinguisher Foam 250ml. Fire Extinguisher Foam 4 in 1 250ml. 4-in-1 Formula: This extinguisher foam is designed to tackle four common types of household fires: Class A (wood, paper), Class B (flammable liquids), Class C (electrical fires), and Class F (cooking oil fires).