When choosing an aluminum sliding door, consider the following factors:

1. Material: Opt for high-quality aluminum for durability and corrosion resistance.

2. Surface Treatment: Select a suitable finish, like anodizing or powder coating, for aesthetics and weather resistance.

3. Thickness: Choose the right thickness; thicker aluminum generally offers better sound insulation and thermal performance.

4. Safety: Look for secure designs and use tempered or laminated glass for safety.

5. Size and Operation: Match the size to your space and decide on a sliding mechanism (single or double track).

6. Brand and After-Sales Service: Choose reputable brands for product quality and customer support.

7. Price: Compare options within your budget to find the best value.