With the 6000 Series Door from Coeur d’Alene, you can enjoy U-values as low as .20, exceeding Energy Star’s definition of a Super Window. In addition, the 6000 Series Door is rated a PG-20 all the way up to a 20’ X 10’ multi-slide configuration (AAMA / FGIA). The 6000 Series is a door that both architects and engineers can love.