OSHA says for Class A fires, which involve ordinary combustible materials like sawdust, employees should never have to travel more than 75 feet to reach a fire extinguisher. Class B hazards, which involve flammable liquids and gases, have stricter requirements. OSHA limits the travel distance from the Class B hazard area to an extinguisher to 50 feet or less. Based on the answer, extinguisher placement would be either 75 or 50 feet, respectively. An extinguisher might technically be only 50 or 75 feet away, but if walls or locked doors are in the way, it's not compliant.