Harvey's The Classic is the most popular vinyl window because it offers the widest variety of style, performance, color, and options available in the marketplace today. The Classic window is available with a variety of mechanically fastened or fully-welded frame and sash options. Custom manufacturing lets you create the perfect window based upon your exact design specifications for a precision fit you can count on. FEATURES: ENERGY STAR qualified with optional Low-E glazing (add Argon gas for additional energy efficiency) Factory calibrated block & tackle sash balances never need adjustment or lubrication Ventilation limit latches that keep top or bottom sash partially open Locking fiberglass half screen Color matched hardware with brasstone and brushed nickel optional