For masonry fireplace openings that are less than 6 square feet, the hearth extension must extend at least _____ inches in front and _____ inches on each side of the fireplace opening.

The correct answer indicates that for masonry fireplace openings smaller than 6 square feet, the hearth extension must extend at least 16 inches in front of the fireplace and 8 inches on each side. This requirement is based on safety standards designed to protect the surrounding areas from heat and embers that can escape during a fire, minimizing the risk of fire hazards.

A hearth extension is crucial in providing a safe barrier that helps prevent any materials or combustible items surrounding the fireplace from igniting. It also serves to catch any ash or embers that may fall out from the fireplace, further enhancing safety within the home.

The dimensions specified—16 inches in front and 8 inches on each side—are carefully chosen to ensure that there is adequate protection without being excessively large, which could be impractical in smaller living spaces. Understanding these specifications is important for compliance with local building codes and for the overall safety of the fireplace installation.