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The minimum height for a fire resistive wall separating oxygen and fuel gases is five feet. This requirement is established to ensure adequate protection against the potential escalation of fire hazards that can result from the mixing of these gases. A wall of this height creates a barrier that helps to prevent flames from spreading and offers a significant level of safety in environments where these gases are stored or utilized.

The specification of five feet is based on industry standards that consider the behavior of fire and gases in the event of an incident. Walls of this height are sufficiently tall to contain any potential fire and mitigate risks, ensuring a safer working environment by providing a physical separation of these hazardous materials. The focus on proper height is critical in emergency planning and risk management in environments dealing with combustible gases.