Series 450 Windows Double Hung, 2 and 3-Lite Sliders and Picture Windows

Beautiful, true brick-mould exterior frame perimeter Both sashes operate and tilt in for easy cleaning Integrated J-channel and nail fin simplify installation (Series 460 available without J-channel) Insulated glass panels with optimum thermal air space featuring warm-edge spacer system Block & Tackle balance system Continuous head and sill on twins and triples Half screen standard* Custom sizes available DP 35 rating (available with DP 50 option) Limited Lifetime Warranty.