These are just regular bricks that I recycled from old landscaping in Spokane. I have a pile of them that I want to use for a brick oven, but about half of the pile found its new home. I have a chimney on my studio that needs to come down so I will have tons of brick.

This build is great since there is no mortar I can just pull bricks out and create more airflow, at any level or any place in the stack that I want.