What is the minimum clearance required between the nozzle and the hazard under NFPA 17?

The minimum clearance required between the nozzle and the hazard, as specified by NFPA 17, is 6 to 12 inches. This distance is critical in ensuring that the dry chemical agent is properly dispersed and can effectively suppress the fire. If the nozzle is placed too far away from the hazard, the distribution of the extinguishing agent may be inadequate, potentially allowing flames to continue burning or re-igniting after the agent has been applied. Conversely, positioning the nozzle too close may obstruct the flow and create inefficient coverage of the fire. This specified clearance helps ensure optimal performance of the extinguishing system while safeguarding surrounding equipment and personnel. Understanding these requirements is essential for the proper installation and operation of dry chemical extinguishing systems.