Masonry Magazine July 1970 Page. 22
Conduit
Outlet box
ELECTRICAL OUTLET BOX
IN UNPLASTERED WALL
Outlet box
ELECTRICAL OUTLET BOX
IN FURRED AND PLASTERED WALL
Duct
Sawed block
DUCT IN
UNPLASTERED WALL
Lath & plaster
Duct
DUCT IN
PLASTERED WALL
NATIONAL CONCRETE MASONRY ASSOCIATION
P.O. Box 9185. Rosslyn Station. Arlington, Virginia 22209