What is the minimum distance a draft hood's relief opening should be from any surface?

The minimum distance for a draft hood's relief opening is set at 6 inches from any surface to ensure that there is adequate airflow and prevent any potential blockage that could impact the efficiency of the appliance. This spacing allows for proper venting of gases and helps maintain safe operation by ensuring that combustion byproducts can be expelled freely. If the relief opening is too close to any surfaces, it could cause a buildup of harmful gases or interfere with the draft, leading to backdraft or incomplete combustion issues. This guideline is essential for both safety and optimal functioning of gas appliances, adhering to industry standards and best practices.