An outdoor AC unit typically weighs 40–80kg; adding operating vibration and wind load, the bracket design needs over 3x redundancy. Lubin brackets use a triangular load-bearing structure, with gauge-grade material thickness (1.8–2.5mm), and all key load points are fully welded.

The workshop has robotic automated welding stations; welds are uniform and the virtual-weld rate approaches zero. Each batch of brackets undergoes a whole-bracket static load test to ensure the rated load is genuine and reliable.