Aluminum—Aluminum frame windows resist light rust and corrosion. Their half track creates more space to transfer goods than full tracks, and makes it simple for customers to pick up materials from their car. Slide materials across a counter instead of lifting them over a full track. They’re not recommended for exterior applications but if they’re used outdoors, an overhang is recommended to protect from rain.

Stainless Steel—Stainless steel frame windows have excellent rust and corrosion resistance. They have a full track that blocks rain from getting inside.

Manual Windows—Manual windows will stay open until you pull them shut. They're best if you often need to make multiple trips and may not have a free hand to open the window every time.

Automatic Windows—Automatic windows slide shut when you release them, so there’s no need to set down what’s in your hands to close them manually. This limits the amount of time the window is open, and reduces the spread of germs between individuals. If you’re transferring objects with both hands, prop open the window first.