This fully welded Series 200 Vinyl Double Hung Replacement Window has exclusively designed chambered ThermoBlok™ extrusions. The best feature of these thermo block extrusions is innovative insulating air barrier technology which leads to reduction of thermal transference from exterior of window frame to interiors, and also "intercept" warm edge glass spacer technology gives added thermal protection to Series 200 Vinyl Double Hung Replacement Window. These features also cut down heating and cooling loads on HVAC systems resulting in long term energy efficiency and utility savings. This Series of 200 Vinyl Double Hung Replacement Window is offered as double hung, bay, bow, slider, casement, and coordinating architectural circle top shapes for increasing the appeal of your home renovation projects. The add-on benefits of this window are that it is easy-to-clean, has tilt out sashes, is available in custom two-tone colors, and decorative grids which make it popular among home owners. Features : Frame Depth : 3-1/4" Insulating Glass Unit Depth : 7/8" Soft Coat Low-E & Argon Filled IGU Tilt Sashes Constant Force Coil Balances Full, Width Ergonomic Lift Rail Fusion Welded Frame & Sashes Dual Vent Locks Heavy-Duty Pocket Sill Double-Seal Weathers tripping Strong Multi-Chamber Construction Continuous Designer Beveled Frame All Around Exterior Options : Extruded Beige Color Painted Exterior Custom Color Between-the-Glass or Exterior Applied Grids Spiral / Block & Tackle Balances Nailing Fin Attachment Triple Glazed Insulated Glass Unit Performa TC™ High Performance Low-E Upgrade Snap-on J-Channel