A concrete masonry unit designed to receive a metal window unit is referred to as what?

The correct term for a concrete masonry unit that is specifically designed to receive a metal window unit is known as a "metal sash." A metal sash typically refers to the framework that holds the window panes in place and is often integrated into the masonry work. This design ensures that the window unit fits securely and is properly supported within the concrete structure.

Other terms, such as header, jamb, and lintel, relate to different components in masonry construction. A header is generally a structural member placed over an opening, meant to distribute the load above it. A jamb refers to the vertical sides of a door or window opening, which provide support but do not specifically denote a unit for receiving windows. A lintel is a horizontal support beam placed over an opening to carry the load above but does not pertain to the specific feature of receiving a window unit.

Understanding these distinctions is crucial in masonry and window installation practices, ensuring that professionals can accurately identify and use the correct components for structural integrity and aesthetic purposes.