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For a one-story dwelling unit, the designed flow rate for sprinklers must be provided for how many minutes?

  1. 5 minutes

  2. 6 minutes

  3. 7 minutes

  4. 8 minutes

The correct answer is: 7 minutes

For a one-story dwelling unit, the designed flow rate for sprinklers must be provided for a duration of 7 minutes. This duration is established because it allows for sufficient water supply to effectively cool and suppress a fire within the early and critical moments of a fire incident. The 7-minute timeframe is based on the understanding that early intervention by sprinkler systems is crucial in minimizing fire damage and safeguarding occupants. Establishing this flow rate is part of the standard practices to ensure adequate fire protection measures are in place, adhering to safety codes and regulations. This requirement is designed to enhance the performance of the sprinkler system, ensuring that it can provide effective coverage and control during the emergency situation, thereby potentially saving lives and property by limiting the spread of flames before fire department personnel arrive on the scene.