Originally Posted by Jerry713
Yep I'm familiar with them. I've built a lot of outdoor fire pits and a couple of outdoor fireplaces when I had a landscape company. I've also replaced many of fire brick because they popped or busted from the heat. Both have their good and bad but I would go steel based in my experience.
Then they weren't installed correctly...not everyone, heck, not even all masonry contractors know how to install them correctly.