The EPA requires that all commercial and industrial process refrigeration systems with more than 50 lb of refrigerant be repaired when the annual leak rate exceeds what percentage?

The correct answer indicates that the EPA requires any commercial and industrial process refrigeration system containing more than 50 pounds of refrigerant to be repaired if the annual leak rate exceeds 35%. This requirement is rooted in the agency's commitment to reducing emissions of ozone-depleting substances and greenhouse gases. High leak rates contribute significantly to these emissions, making it essential for systems to be maintained properly to minimize their environmental impact.

The choice of 35% is based on regulatory standards which are designed to ensure that refrigerants are conserved and that systems are functioning efficiently. By mandating repairs at this threshold, the EPA encourages regular maintenance and timely intervention, which can also lead to improved system performance and reduced operational costs.

Understanding the regulatory framework surrounding refrigeration systems and their leak rates is crucial for compliance with environmental standards and for the effective management of refrigerant use in commercial and industrial applications.