Chimney Safety Institute of America (CSIA) Certification Practice Test

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For openings of 6 square feet or larger, the hearth extension must extend how many inches in front of the facing?

16 inches
18 inches
20 inches
24 inches

The correct answer is: 20 inches

The hearth extension for openings of 6 square feet or larger is required to extend 20 inches in front of the facing. This requirement is in place to provide adequate protection for combustible materials in front of the fireplace, ensuring that any embers, sparks, or heat generated by the fire do not pose a risk of igniting surrounding materials. This specific measurement is part of the safety regulations established to maintain safe distances and prevent fire hazards associated with larger fireplace openings. By extending the hearth adequately, it helps to create a barrier that can contain any potential hazards from the fire, promoting overall fireplace safety.