1200 Series WindowsA full family of welded vinyl windows ideal for most applications. Our 1200 Series features 7/8" IG in a 2-5/8" welded vinyl frame. J-channel options include integral or snap-in and a nailing flange is standard. One of the best window values on the market today, 1200 Series windows are available in horizontal sliding, single hung, 3-lite slider, fixed and architectural shape configurations. Also available in light stone or a limited range of two-tone colors.