Solving the problem of non-explosion-proof large motors in explosion-proof areas

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The safety supervision agency has inspected our factory on several occasions and raised concerns regarding the fact that multiple large motors in use are not explosion-proof. However, replacing these large non-explosion-proof motors (such as those used in ammonia refrigeration units or 5000KW hydrogen-nitrogen compressors) would involve significant costs. Experts from the safety supervision agency mentioned that Article 50058 states that positive pressure ventilation can be used to convert areas into non-explosion-proof zones; yet after conducting further research, it was found that there are also strict requirements regarding positive pressure ventilation. Therefore, I would like to ask the experts: are there any specific requirements and standards for converting explosion-proof areas in a factory into non-explosion-proof areas? Is it possible to provide positive pressure ventilation only for the motor and control box? Are there any specific PPTs or examples recommended?