nonflush

Nonflush is a descriptive term used across various technical and design disciplines to refer to an element that does not sit level with or align with a surrounding plane or surface. It is typically used descriptively rather than as a formal standard, and its precise meaning can vary by domain.

In architecture and interior design, nonflush describes surfaces, edges, or fixtures that protrude beyond adjacent surfaces. This can be intentional, forming a deliberate design feature or reveal, or incidental, arising from tolerances or installation methods. Examples include nonflush cabinet doors, trim that projects beyond a wall plane, or fixtures mounted in a way that they do not sit flush with surrounding surfaces.

In manufacturing and mechanical engineering, nonflush refers to components that are not coplanar with a reference surface. This can arise from assembly choices, spacers, fasteners, or shims that create a protrusion or step. Nonflush conditions can affect assembly accuracy, sealing, fit, and aesthetics, and are often managed through design tolerances or corrective finishing.

In electrical, electronics, and enclosure design, nonflush components may protrude from housings to allow access to connectors, provide ventilation, or accommodate mounting hardware. While sometimes purposeful, protruding elements can also pose challenges for enclosure integrity or user interaction.

Etymology and usage notes: the term derives from the opposite of flush, which means level or even with a reference surface. Because “nonflush” is not a formal specification, its interpretation depends on context, and engineers or designers usually specify the intended geometry with drawings or notes.

See also: flush, flush mounting, protrusion, planar tolerance.