Harvey patio doors are Energy Star qualified with standard Low-E/ Argon glazing. All Harvey patio doors are constructed from heavy-duty aluminum for durability and strength.
The sill of the Andersen Narroline gliding patio doors with 1 and 2 panels have an anodized aluminum track with a stainless steel cap that resists staining, rust, and denting.
The sill of the Andersen Perma-Shield gliding patio door has an anodized aluminum track with a stainless steel cap that resists staining, rust, and denting.