![Concrete masonry unit](/6ky5vhl/62.jpg)
Concrete masonry unit
A concrete masonry unit (CMU) is a standardsize rectangular block used in building are some of the most versatile building products available because of the wide variety of appearances that can be achieved using them. Those that use cinders (fly ash or bottom ash) as an aggregate material are called cinder blocks in the United States, breeze blocks (breeze is a synonym of ...