Fireplace hearth question

Does a gas only fireplace also require a hearth extension of at least 16"?

Thank you!

Most modern gas only fireplaces with fixed glass do not require a hearth extension. The manufacturers usually require a 36" clear space in front (no furniture, etc.). Now if this was a wood burning fireplace that had a gas insert, the hearth extension would still be required. Once wood burning, always wood burning.

Thank you!