Building unit (6,5)
I believe the answer is:
breeze block
(Other definitions for breeze block that I've seen before include "Large light brick" , "Building brick" , "Lightweight brick" , "part of a build-up?" .)
I believe the answer is:
breeze block
(Other definitions for breeze block that I've seen before include "Large light brick" , "Building brick" , "Lightweight brick" , "part of a build-up?" .)