PolarTech Patio DoorsHome / Doors / PolarTech Patio DoorsPolarTech 8000 Patio DoorYour pristine PolarTech patio door will be energy efficient and maintenance free for a lifetime. Vertical door panel extrusions are reinforced with aluminum. Door panels meet with Over and Under Interlock and feature double weather-stripping.PolarTech 5000 Patio DoorEnergy Efficiency. Ease of Operation and Ownership.Fusion welded 4 ¾” frame and sash corners. Aluminum rebar in interlock stiles and lock stile. Stainless steel roller track. Additional lock point with kick lockallows secure partial opening. Foam filled main frame extrusions.*PolarTech 3000 Patio DoorEnergy Saving and Maintenance Free at an Economical PriceVinyl compound retains its pristine appearance. Fusion welded 4 3/4” frame and sash corners. Left or right operable reversible door panel. Aluminum rebar in interlock stiles and lock stile. Stainless steel roller track.