Section 906 requires portable fire extinguishers in all buildings. Class A extinguishers for ordinary combustibles are typically required in office areas. Class B extinguishers for flammable liquids are required where liquid storage or use occurs. Class K extinguishers (for cooking oils) are required in kitchens with cooking equipment. Extinguisher placement must be within maximum 75 feet travel distance to the nearest extinguisher. Extinguisher size and quantity depend on area and hazard level.