Versatile Fireplaces ~ With a Fuego Flame Fireplace Insert, you can maintain your fireplace's beauty and improve its heat efficiency. The Fuego Flame Fireplace Inserts are available in four different sizes that install recessed or flush with the front of your existing masonry fireplace. They fit in most standard fireplaces, arched fireplaces, stone fireplaces, curved fireplaces and even unusually shaped fireplaces.