Choosing between surface-mount and flush-mount enclosures depends primarily on whether site conditions permit wall cutting, embedding, and structural alterations. Surface-mount enclosures mount directly onto walls or equipment exteriors, making them ideal for plant retrofits, control system upgrades, and time-sensitive projects. Surface mounting is also far easier to implement on thin walls, walls with internal utilities, or surfaces unsuitable for recessed cavities.

Flush-mount enclosures minimize external protrusion, but cutout dimensions, recess depth, and door-to-wall alignment must be finalized during design. Surface-mount enclosures offer greater flexibility for adding control units or reconfiguring layouts later. Final selection should weigh aesthetics, maintenance clearance, wall structure, equipment depth, and installation costs, rather than enclosure dimensions alone.