Springline™ Half and Round Top Windows with Renaissance Grille  To see Springline™ Half and Round Top Windows with Colonial Grille sizes click here NOTE: Springline extension jambs are factory applied when ordered with the unit.  * These units come standard with tempered glazing.  • "Unit Dimension" always refers to outside frame to frame dimension.  • Dimensions in parentheses are in millimeters.  • Springline window units are stationary.  • Combinations of window units joined together may require horizontal or vertical reinforcement. This reinforcement should be specified by a professional engineer. Contact your Andersen® supplier for more information.  • When ordering, be sure to specify color desired: white, Sandtone, or Terratone®.    Grille alignment with other Andersen products. All vertical Springline window grille members were designed to be equally spaced. Vertical alignment may not coincide when units are transom joined. All horizontal grille members were designed to line up with corresponding casement sizes. Special order Arch window grilles are available to achieve proper alignment.