What is the minimum hearth extension required in front of a fireplace?

The minimum hearth extension required in front of a fireplace is 16 inches. This measurement is crucial for safety and functional purposes, as it helps to protect the floor from the heat generated by the fire and prevents embers, coal, or ash from spilling out of the fireplace unit. The 16-inch extension is a widely accepted standard, providing sufficient area to catch any falling debris and serving as a barrier to heat, ensuring that combustible flooring materials do not ignite.

In addition, a properly sized hearth extension contributes to the overall design and usability of the fireplace, allowing for safe distance for people nearby and promoting better air circulation around the fire. This standard is often governed by codes and regulations to ensure fire safety in residential buildings.