How many feet is the firebreak around the ventilators of earth-covered magazines?

The appropriate width for the firebreak around the ventilators of earth-covered magazines is 5 feet. This specification is critical because it helps to minimize the risk of fire spreading to or from the magazine structures. A firebreak serves as a safety measure, creating a clear area free of combustible material that could otherwise facilitate the spread of fire.

The requirement for 5 feet ensures adequate clearance for emergency personnel and equipment to operate safely and effectively while also protecting the integrity of the magazine itself. This safety protocol is likely based on industry standards and regulations that govern the storage of explosive materials, where maintaining a proper distance from potential fire sources is vital.

Other options do not reflect the established standard for firebreaks around such structures as they exceed or do not meet the necessary safety distances stipulated in relevant guidelines.