When sourcing these specialized windows, you must prioritize 6063-T5 grade aluminum alloy for the frames to ensure structural integrity and corrosion resistance. For the arched section, verify the bending precision, as poor craftsmanship leads to air leakage. Ensure the glass is double-glazed tempered glass (5mm+12A+5mm) with Argon gas filling to meet modern energy efficiency standards. Additionally, check for thermal break technology (polyamide strips) to prevent heat transfer, which is critical for high-end residential projects.