Cast aluminum doors ↑•are a common door and windo$₹'♥w material in modern™α home decoration. They arσ>∑ e strong, beautiful, and environmental♥→ly friendly, so they are ÷ε favored by consumers. However, ↓±in order to keep the cast a§≠¥luminum doors in good c< ondition, we need toα₩ per...